granicus.if.org Git - imagemagick/blob - MagickCore/histogram.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %      H   H   IIIII   SSSSS  TTTTT   OOO    GGGG  RRRR    AAA   M   M        %
   7 %      H   H     I     SS       T    O   O  G      R   R  A   A  MM MM        %
   8 %      HHHHH     I      SSS     T    O   O  G  GG  RRRR   AAAAA  M M M        %
   9 %      H   H     I        SS    T    O   O  G   G  R R    A   A  M   M        %
  10 %      H   H   IIIII   SSSSS    T     OOO    GGG   R  R   A   A  M   M        %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        MagickCore Histogram Methods                         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                              Anthony Thyssen                                %
  17 %                               Fred Weinhaus                                 %
  18 %                                August 2009                                  %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %
  38 */
  39 \f
  40 /*
  41   Include declarations.
  42 */
  43 #include "MagickCore/studio.h"
  44 #include "MagickCore/cache-view.h"
  45 #include "MagickCore/color-private.h"
  46 #include "MagickCore/enhance.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/hashmap.h"
  50 #include "MagickCore/histogram.h"
  51 #include "MagickCore/image.h"
  52 #include "MagickCore/list.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/monitor-private.h"
  55 #include "MagickCore/pixel-accessor.h"
  56 #include "MagickCore/prepress.h"
  57 #include "MagickCore/quantize.h"
  58 #include "MagickCore/registry.h"
  59 #include "MagickCore/semaphore.h"
  60 #include "MagickCore/splay-tree.h"
  61 #include "MagickCore/statistic.h"
  62 #include "MagickCore/string_.h"
  63 \f
  64 /*
  65   Define declarations.
  66 */
  67 #define MaxTreeDepth  8
  68 #define NodesInAList  1536
  69 \f
  70 /*
  71   Typedef declarations.
  72 */
  73 typedef struct _NodeInfo
  74 {
  75   struct _NodeInfo
  76     *child[16];
  77
  78   PixelPacket
  79     *list;
  80
  81   MagickSizeType
  82     number_unique;
  83
  84   size_t
  85     level;
  86 } NodeInfo;
  87
  88 typedef struct _Nodes
  89 {
  90   NodeInfo
  91     nodes[NodesInAList];
  92
  93   struct _Nodes
  94     *next;
  95 } Nodes;
  96
  97 typedef struct _CubeInfo
  98 {
  99   NodeInfo
 100     *root;
 101
 102   ssize_t
 103     x;
 104
 105   MagickOffsetType
 106     progress;
 107
 108   size_t
 109     colors,
 110     free_nodes;
 111
 112   NodeInfo
 113     *node_info;
 114
 115   Nodes
 116     *node_queue;
 117 } CubeInfo;
 118 \f
 119 /*
 120   Forward declarations.
 121 */
 122 static CubeInfo
 123   *GetCubeInfo(void);
 124
 125 static NodeInfo
 126   *GetNodeInfo(CubeInfo *,const size_t);
 127
 128 static void
 129   DestroyColorCube(const Image *,NodeInfo *);
 130 \f
 131 /*
 132 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 133 %                                                                             %
 134 %                                                                             %
 135 %                                                                             %
 136 +   C l a s s i f y I m a g e C o l o r s                                     %
 137 %                                                                             %
 138 %                                                                             %
 139 %                                                                             %
 140 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 141 %
 142 %  ClassifyImageColors() builds a populated CubeInfo tree for the specified
 143 %  image.  The returned tree should be deallocated using DestroyCubeInfo()
 144 %  once it is no longer needed.
 145 %
 146 %  The format of the ClassifyImageColors() method is:
 147 %
 148 %      CubeInfo *ClassifyImageColors(const Image *image,
 149 %        ExceptionInfo *exception)
 150 %
 151 %  A description of each parameter follows.
 152 %
 153 %    o image: the image.
 154 %
 155 %    o exception: return any errors or warnings in this structure.
 156 %
 157 */
 158
 159 static inline size_t ColorToNodeId(const Image *image,
 160   const PixelInfo *pixel,size_t index)
 161 {
 162   size_t
 163     id;
 164
 165   id=(size_t) (
 166     ((ScaleQuantumToChar(ClampToQuantum(pixel->red)) >> index) & 0x01) |
 167     ((ScaleQuantumToChar(ClampToQuantum(pixel->green)) >> index) & 0x01) << 1 |
 168     ((ScaleQuantumToChar(ClampToQuantum(pixel->blue)) >> index) & 0x01) << 2);
 169   if (image->matte != MagickFalse)
 170     id|=((ScaleQuantumToChar(ClampToQuantum(pixel->alpha)) >> index) &
 171       0x01) << 3;
 172   return(id);
 173 }
 174
 175 static CubeInfo *ClassifyImageColors(const Image *image,
 176   ExceptionInfo *exception)
 177 {
 178 #define EvaluateImageTag  "  Compute image colors...  "
 179
 180   CacheView
 181     *image_view;
 182
 183   CubeInfo
 184     *cube_info;
 185
 186   MagickBooleanType
 187     proceed;
 188
 189   PixelInfo
 190     pixel,
 191     target;
 192
 193   NodeInfo
 194     *node_info;
 195
 196   register const Quantum
 197     *p;
 198
 199   register size_t
 200     id,
 201     index,
 202     level;
 203
 204   register ssize_t
 205     i,
 206     x;
 207
 208   ssize_t
 209     y;
 210
 211   /*
 212     Initialize color description tree.
 213   */
 214   assert(image != (const Image *) NULL);
 215   assert(image->signature == MagickSignature);
 216   if (image->debug != MagickFalse)
 217     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 218   cube_info=GetCubeInfo();
 219   if (cube_info == (CubeInfo *) NULL)
 220     {
 221       (void) ThrowMagickException(exception,GetMagickModule(),
 222         ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 223       return(cube_info);
 224     }
 225   GetPixelInfo(image,&pixel);
 226   GetPixelInfo(image,&target);
 227   image_view=AcquireCacheView(image);
 228   for (y=0; y < (ssize_t) image->rows; y++)
 229   {
 230     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 231     if (p == (const Quantum *) NULL)
 232       break;
 233     for (x=0; x < (ssize_t) image->columns; x++)
 234     {
 235       /*
 236         Start at the root and proceed level by level.
 237       */
 238       node_info=cube_info->root;
 239       index=MaxTreeDepth-1;
 240       for (level=1; level < MaxTreeDepth; level++)
 241       {
 242         SetPixelInfo(image,p,&pixel);
 243         id=ColorToNodeId(image,&pixel,index);
 244         if (node_info->child[id] == (NodeInfo *) NULL)
 245           {
 246             node_info->child[id]=GetNodeInfo(cube_info,level);
 247             if (node_info->child[id] == (NodeInfo *) NULL)
 248               {
 249                 (void) ThrowMagickException(exception,GetMagickModule(),
 250                   ResourceLimitError,"MemoryAllocationFailed","`%s'",
 251                   image->filename);
 252                 return(0);
 253               }
 254           }
 255         node_info=node_info->child[id];
 256         index--;
 257       }
 258       for (i=0; i < (ssize_t) node_info->number_unique; i++)
 259       {
 260         SetPixelInfoPacket(image,&node_info->list[i],&target);
 261         if (IsPixelInfoEquivalent(&pixel,&target) != MagickFalse)
 262           break;
 263       }
 264       if (i < (ssize_t) node_info->number_unique)
 265         node_info->list[i].count++;
 266       else
 267         {
 268           if (node_info->number_unique == 0)
 269             node_info->list=(PixelPacket *) AcquireMagickMemory(
 270               sizeof(*node_info->list));
 271           else
 272             node_info->list=(PixelPacket *) ResizeQuantumMemory(node_info->list,
 273               (size_t) (i+1),sizeof(*node_info->list));
 274           if (node_info->list == (PixelPacket *) NULL)
 275             {
 276               (void) ThrowMagickException(exception,GetMagickModule(),
 277                 ResourceLimitError,"MemoryAllocationFailed","`%s'",
 278                 image->filename);
 279               return(0);
 280             }
 281           node_info->list[i].red=GetPixelRed(image,p);
 282           node_info->list[i].green=GetPixelGreen(image,p);
 283           node_info->list[i].blue=GetPixelBlue(image,p);
 284           if (image->colorspace == CMYKColorspace)
 285             node_info->list[i].black=GetPixelBlack(image,p);
 286           node_info->list[i].alpha=GetPixelAlpha(image,p);
 287           node_info->list[i].count=1;
 288           node_info->number_unique++;
 289           cube_info->colors++;
 290         }
 291       p+=GetPixelChannels(image);
 292     }
 293     proceed=SetImageProgress(image,EvaluateImageTag,(MagickOffsetType) y,
 294       image->rows);
 295     if (proceed == MagickFalse)
 296       break;
 297   }
 298   image_view=DestroyCacheView(image_view);
 299   return(cube_info);
 300 }
 301 \f
 302 /*
 303 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 304 %                                                                             %
 305 %                                                                             %
 306 %                                                                             %
 307 +   D e f i n e I m a g e H i s t o g r a m                                   %
 308 %                                                                             %
 309 %                                                                             %
 310 %                                                                             %
 311 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 312 %
 313 %  DefineImageHistogram() traverses the color cube tree and notes each colormap
 314 %  entry.  A colormap entry is any node in the color cube tree where the
 315 %  of unique colors is not zero.
 316 %
 317 %  The format of the DefineImageHistogram method is:
 318 %
 319 %      DefineImageHistogram(const Image *image,NodeInfo *node_info,
 320 %        PixelPacket **unique_colors)
 321 %
 322 %  A description of each parameter follows.
 323 %
 324 %    o image: the image.
 325 %
 326 %    o node_info: the address of a structure of type NodeInfo which points to a
 327 %      node in the color cube tree that is to be pruned.
 328 %
 329 %    o histogram: the image histogram.
 330 %
 331 */
 332 static void DefineImageHistogram(const Image *image,NodeInfo *node_info,
 333   PixelPacket **histogram)
 334 {
 335   register ssize_t
 336     i;
 337
 338   size_t
 339     number_children;
 340
 341   /*
 342     Traverse any children.
 343   */
 344   number_children=image->matte == MagickFalse ? 8UL : 16UL;
 345   for (i=0; i < (ssize_t) number_children; i++)
 346     if (node_info->child[i] != (NodeInfo *) NULL)
 347       DefineImageHistogram(image,node_info->child[i],histogram);
 348   if (node_info->level == (MaxTreeDepth-1))
 349     {
 350       register PixelPacket
 351         *p;
 352
 353       p=node_info->list;
 354       for (i=0; i < (ssize_t) node_info->number_unique; i++)
 355       {
 356         (*histogram)->red=p->red;
 357         (*histogram)->green=p->green;
 358         (*histogram)->blue=p->blue;
 359         (*histogram)->black=p->black;
 360         (*histogram)->alpha=p->alpha;
 361         (*histogram)->count=p->count;
 362         (*histogram)++;
 363         p++;
 364       }
 365     }
 366 }
 367 \f
 368 /*
 369 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 370 %                                                                             %
 371 %                                                                             %
 372 %                                                                             %
 373 +   D e s t r o y C u b e I n f o                                             %
 374 %                                                                             %
 375 %                                                                             %
 376 %                                                                             %
 377 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 378 %
 379 %  DestroyCubeInfo() deallocates memory associated with a CubeInfo structure.
 380 %
 381 %  The format of the DestroyCubeInfo method is:
 382 %
 383 %      DestroyCubeInfo(const Image *image,CubeInfo *cube_info)
 384 %
 385 %  A description of each parameter follows:
 386 %
 387 %    o image: the image.
 388 %
 389 %    o cube_info: the address of a structure of type CubeInfo.
 390 %
 391 */
 392 static CubeInfo *DestroyCubeInfo(const Image *image,CubeInfo *cube_info)
 393 {
 394   register Nodes
 395     *nodes;
 396
 397   /*
 398     Release color cube tree storage.
 399   */
 400   DestroyColorCube(image,cube_info->root);
 401   do
 402   {
 403     nodes=cube_info->node_queue->next;
 404     cube_info->node_queue=(Nodes *)
 405       RelinquishMagickMemory(cube_info->node_queue);
 406     cube_info->node_queue=nodes;
 407   } while (cube_info->node_queue != (Nodes *) NULL);
 408   return((CubeInfo *) RelinquishMagickMemory(cube_info));
 409 }
 410 \f
 411 /*
 412 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 413 %                                                                             %
 414 %                                                                             %
 415 %                                                                             %
 416 +  D e s t r o y C o l o r C u b e                                            %
 417 %                                                                             %
 418 %                                                                             %
 419 %                                                                             %
 420 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 421 %
 422 %  DestroyColorCube() traverses the color cube tree and frees the list of
 423 %  unique colors.
 424 %
 425 %  The format of the DestroyColorCube method is:
 426 %
 427 %      void DestroyColorCube(const Image *image,const NodeInfo *node_info)
 428 %
 429 %  A description of each parameter follows.
 430 %
 431 %    o image: the image.
 432 %
 433 %    o node_info: the address of a structure of type NodeInfo which points to a
 434 %      node in the color cube tree that is to be pruned.
 435 %
 436 */
 437 static void DestroyColorCube(const Image *image,NodeInfo *node_info)
 438 {
 439   register ssize_t
 440     i;
 441
 442   size_t
 443     number_children;
 444
 445   /*
 446     Traverse any children.
 447   */
 448   number_children=image->matte == MagickFalse ? 8UL : 16UL;
 449   for (i=0; i < (ssize_t) number_children; i++)
 450     if (node_info->child[i] != (NodeInfo *) NULL)
 451       DestroyColorCube(image,node_info->child[i]);
 452   if (node_info->list != (PixelPacket *) NULL)
 453     node_info->list=(PixelPacket *) RelinquishMagickMemory(node_info->list);
 454 }
 455 \f
 456 /*
 457 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 458 %                                                                             %
 459 %                                                                             %
 460 %                                                                             %
 461 +   G e t C u b e I n f o                                                     %
 462 %                                                                             %
 463 %                                                                             %
 464 %                                                                             %
 465 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 466 %
 467 %  GetCubeInfo() initializes the CubeInfo data structure.
 468 %
 469 %  The format of the GetCubeInfo method is:
 470 %
 471 %      cube_info=GetCubeInfo()
 472 %
 473 %  A description of each parameter follows.
 474 %
 475 %    o cube_info: A pointer to the Cube structure.
 476 %
 477 */
 478 static CubeInfo *GetCubeInfo(void)
 479 {
 480   CubeInfo
 481     *cube_info;
 482
 483   /*
 484     Initialize tree to describe color cube.
 485   */
 486   cube_info=(CubeInfo *) AcquireMagickMemory(sizeof(*cube_info));
 487   if (cube_info == (CubeInfo *) NULL)
 488     return((CubeInfo *) NULL);
 489   (void) ResetMagickMemory(cube_info,0,sizeof(*cube_info));
 490   /*
 491     Initialize root node.
 492   */
 493   cube_info->root=GetNodeInfo(cube_info,0);
 494   if (cube_info->root == (NodeInfo *) NULL)
 495     return((CubeInfo *) NULL);
 496   return(cube_info);
 497 }
 498 \f
 499 /*
 500 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 501 %                                                                             %
 502 %                                                                             %
 503 %                                                                             %
 504 %  G e t I m a g e H i s t o g r a m                                          %
 505 %                                                                             %
 506 %                                                                             %
 507 %                                                                             %
 508 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 509 %
 510 %  GetImageHistogram() returns the unique colors in an image.
 511 %
 512 %  The format of the GetImageHistogram method is:
 513 %
 514 %      size_t GetImageHistogram(const Image *image,
 515 %        size_t *number_colors,ExceptionInfo *exception)
 516 %
 517 %  A description of each parameter follows.
 518 %
 519 %    o image: the image.
 520 %
 521 %    o file:  Write a histogram of the color distribution to this file handle.
 522 %
 523 %    o exception: return any errors or warnings in this structure.
 524 %
 525 */
 526 MagickExport PixelPacket *GetImageHistogram(const Image *image,
 527   size_t *number_colors,ExceptionInfo *exception)
 528 {
 529   PixelPacket
 530     *histogram;
 531
 532   CubeInfo
 533     *cube_info;
 534
 535   *number_colors=0;
 536   histogram=(PixelPacket *) NULL;
 537   cube_info=ClassifyImageColors(image,exception);
 538   if (cube_info != (CubeInfo *) NULL)
 539     {
 540       histogram=(PixelPacket *) AcquireQuantumMemory((size_t) cube_info->colors,
 541         sizeof(*histogram));
 542       if (histogram == (PixelPacket *) NULL)
 543         (void) ThrowMagickException(exception,GetMagickModule(),
 544           ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 545       else
 546         {
 547           PixelPacket
 548             *root;
 549
 550           *number_colors=cube_info->colors;
 551           root=histogram;
 552           DefineImageHistogram(image,cube_info->root,&root);
 553         }
 554     }
 555   cube_info=DestroyCubeInfo(image,cube_info);
 556   return(histogram);
 557 }
 558 \f
 559 /*
 560 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 561 %                                                                             %
 562 %                                                                             %
 563 %                                                                             %
 564 +  G e t N o d e I n f o                                                      %
 565 %                                                                             %
 566 %                                                                             %
 567 %                                                                             %
 568 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 569 %
 570 %  GetNodeInfo() allocates memory for a new node in the color cube tree and
 571 %  presets all fields to zero.
 572 %
 573 %  The format of the GetNodeInfo method is:
 574 %
 575 %      NodeInfo *GetNodeInfo(CubeInfo *cube_info,const size_t level)
 576 %
 577 %  A description of each parameter follows.
 578 %
 579 %    o cube_info: A pointer to the CubeInfo structure.
 580 %
 581 %    o level: Specifies the level in the storage_class the node resides.
 582 %
 583 */
 584 static NodeInfo *GetNodeInfo(CubeInfo *cube_info,const size_t level)
 585 {
 586   NodeInfo
 587     *node_info;
 588
 589   if (cube_info->free_nodes == 0)
 590     {
 591       Nodes
 592         *nodes;
 593
 594       /*
 595         Allocate a new nodes of nodes.
 596       */
 597       nodes=(Nodes *) AcquireMagickMemory(sizeof(*nodes));
 598       if (nodes == (Nodes *) NULL)
 599         return((NodeInfo *) NULL);
 600       nodes->next=cube_info->node_queue;
 601       cube_info->node_queue=nodes;
 602       cube_info->node_info=nodes->nodes;
 603       cube_info->free_nodes=NodesInAList;
 604     }
 605   cube_info->free_nodes--;
 606   node_info=cube_info->node_info++;
 607   (void) ResetMagickMemory(node_info,0,sizeof(*node_info));
 608   node_info->level=level;
 609   return(node_info);
 610 }
 611 \f
 612 /*
 613 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 614 %                                                                             %
 615 %                                                                             %
 616 %                                                                             %
 617 %  I s H i s t o g r a m I m a g e                                            %
 618 %                                                                             %
 619 %                                                                             %
 620 %                                                                             %
 621 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 622 %
 623 %  IsHistogramImage() returns MagickTrue if the image has 1024 unique colors or
 624 %  less.
 625 %
 626 %  The format of the IsHistogramImage method is:
 627 %
 628 %      MagickBooleanType IsHistogramImage(const Image *image,
 629 %        ExceptionInfo *exception)
 630 %
 631 %  A description of each parameter follows.
 632 %
 633 %    o image: the image.
 634 %
 635 %    o exception: return any errors or warnings in this structure.
 636 %
 637 */
 638 MagickExport MagickBooleanType IsHistogramImage(const Image *image,
 639   ExceptionInfo *exception)
 640 {
 641 #define MaximumUniqueColors  1024
 642
 643   CacheView
 644     *image_view;
 645
 646   CubeInfo
 647     *cube_info;
 648
 649   PixelInfo
 650     pixel,
 651     target;
 652
 653   register const Quantum
 654     *p;
 655
 656   register ssize_t
 657     x;
 658
 659   register NodeInfo
 660     *node_info;
 661
 662   register ssize_t
 663     i;
 664
 665   size_t
 666     id,
 667     index,
 668     level;
 669
 670   ssize_t
 671     y;
 672
 673   assert(image != (Image *) NULL);
 674   assert(image->signature == MagickSignature);
 675   if (image->debug != MagickFalse)
 676     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 677   if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 678     return(MagickTrue);
 679   if (image->storage_class == PseudoClass)
 680     return(MagickFalse);
 681   /*
 682     Initialize color description tree.
 683   */
 684   cube_info=GetCubeInfo();
 685   if (cube_info == (CubeInfo *) NULL)
 686     {
 687       (void) ThrowMagickException(exception,GetMagickModule(),
 688         ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 689       return(MagickFalse);
 690     }
 691   GetPixelInfo(image,&pixel);
 692   GetPixelInfo(image,&target);
 693   image_view=AcquireCacheView(image);
 694   for (y=0; y < (ssize_t) image->rows; y++)
 695   {
 696     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 697     if (p == (const Quantum *) NULL)
 698       break;
 699     for (x=0; x < (ssize_t) image->columns; x++)
 700     {
 701       /*
 702         Start at the root and proceed level by level.
 703       */
 704       node_info=cube_info->root;
 705       index=MaxTreeDepth-1;
 706       for (level=1; level < MaxTreeDepth; level++)
 707       {
 708         SetPixelInfo(image,p,&pixel);
 709         id=ColorToNodeId(image,&pixel,index);
 710         if (node_info->child[id] == (NodeInfo *) NULL)
 711           {
 712             node_info->child[id]=GetNodeInfo(cube_info,level);
 713             if (node_info->child[id] == (NodeInfo *) NULL)
 714               {
 715                 (void) ThrowMagickException(exception,GetMagickModule(),
 716                   ResourceLimitError,"MemoryAllocationFailed","`%s'",
 717                   image->filename);
 718                 break;
 719               }
 720           }
 721         node_info=node_info->child[id];
 722         index--;
 723       }
 724       if (level < MaxTreeDepth)
 725         break;
 726       for (i=0; i < (ssize_t) node_info->number_unique; i++)
 727       {
 728         SetPixelInfoPacket(image,&node_info->list[i],&target);
 729         if (IsPixelInfoEquivalent(&pixel,&target) != MagickFalse)
 730           break;
 731       }
 732       if (i < (ssize_t) node_info->number_unique)
 733         node_info->list[i].count++;
 734       else
 735         {
 736           /*
 737             Add this unique color to the color list.
 738           */
 739           if (node_info->number_unique == 0)
 740             node_info->list=(PixelPacket *) AcquireMagickMemory(
 741               sizeof(*node_info->list));
 742           else
 743             node_info->list=(PixelPacket *) ResizeQuantumMemory(node_info->list,
 744               (size_t) (i+1),sizeof(*node_info->list));
 745           if (node_info->list == (PixelPacket *) NULL)
 746             {
 747               (void) ThrowMagickException(exception,GetMagickModule(),
 748                 ResourceLimitError,"MemoryAllocationFailed","`%s'",
 749                 image->filename);
 750               break;
 751             }
 752           node_info->list[i].red=GetPixelRed(image,p);
 753           node_info->list[i].green=GetPixelGreen(image,p);
 754           node_info->list[i].blue=GetPixelBlue(image,p);
 755           if (image->colorspace == CMYKColorspace)
 756             node_info->list[i].black=GetPixelBlack(image,p);
 757           node_info->list[i].alpha=GetPixelAlpha(image,p);
 758           node_info->list[i].count=1;
 759           node_info->number_unique++;
 760           cube_info->colors++;
 761           if (cube_info->colors > MaximumUniqueColors)
 762             break;
 763         }
 764       p+=GetPixelChannels(image);
 765     }
 766     if (x < (ssize_t) image->columns)
 767       break;
 768   }
 769   image_view=DestroyCacheView(image_view);
 770   cube_info=DestroyCubeInfo(image,cube_info);
 771   return(y < (ssize_t) image->rows ? MagickFalse : MagickTrue);
 772 }
 773 \f
 774 /*
 775 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 776 %                                                                             %
 777 %                                                                             %
 778 %                                                                             %
 779 %  I s P a l e t t e I m a g e                                                %
 780 %                                                                             %
 781 %                                                                             %
 782 %                                                                             %
 783 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 784 %
 785 %  IsPaletteImage() returns MagickTrue if the image is PseudoClass and has 256
 786 %  unique colors or less.
 787 %
 788 %  The format of the IsPaletteImage method is:
 789 %
 790 %      MagickBooleanType IsPaletteImage(const Image *image,
 791 %        ExceptionInfo *exception)
 792 %
 793 %  A description of each parameter follows.
 794 %
 795 %    o image: the image.
 796 %
 797 %    o exception: return any errors or warnings in this structure.
 798 %
 799 */
 800 MagickExport MagickBooleanType IsPaletteImage(const Image *image,
 801   ExceptionInfo *exception)
 802 {
 803   CacheView
 804     *image_view;
 805
 806   CubeInfo
 807     *cube_info;
 808
 809   PixelInfo
 810     pixel,
 811     target;
 812
 813   register const Quantum
 814     *p;
 815
 816   register ssize_t
 817     x;
 818
 819   register NodeInfo
 820     *node_info;
 821
 822   register ssize_t
 823     i;
 824
 825   size_t
 826     id,
 827     index,
 828     level;
 829
 830   ssize_t
 831     y;
 832
 833   assert(image != (Image *) NULL);
 834   assert(image->signature == MagickSignature);
 835   if (image->debug != MagickFalse)
 836     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 837   if ((image->storage_class == PseudoClass) && (image->colors <= 256))
 838     return(MagickTrue);
 839   if (image->storage_class == PseudoClass)
 840     return(MagickFalse);
 841   /*
 842     Initialize color description tree.
 843   */
 844   cube_info=GetCubeInfo();
 845   if (cube_info == (CubeInfo *) NULL)
 846     {
 847       (void) ThrowMagickException(exception,GetMagickModule(),
 848         ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
 849       return(MagickFalse);
 850     }
 851   GetPixelInfo(image,&pixel);
 852   GetPixelInfo(image,&target);
 853   image_view=AcquireCacheView(image);
 854   for (y=0; y < (ssize_t) image->rows; y++)
 855   {
 856     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 857     if (p == (const Quantum *) NULL)
 858       break;
 859     for (x=0; x < (ssize_t) image->columns; x++)
 860     {
 861       /*
 862         Start at the root and proceed level by level.
 863       */
 864       node_info=cube_info->root;
 865       index=MaxTreeDepth-1;
 866       for (level=1; level < MaxTreeDepth; level++)
 867       {
 868         SetPixelInfo(image,p,&pixel);
 869         id=ColorToNodeId(image,&pixel,index);
 870         if (node_info->child[id] == (NodeInfo *) NULL)
 871           {
 872             node_info->child[id]=GetNodeInfo(cube_info,level);
 873             if (node_info->child[id] == (NodeInfo *) NULL)
 874               {
 875                 (void) ThrowMagickException(exception,GetMagickModule(),
 876                   ResourceLimitError,"MemoryAllocationFailed","`%s'",
 877                   image->filename);
 878                 break;
 879               }
 880           }
 881         node_info=node_info->child[id];
 882         index--;
 883       }
 884       if (level < MaxTreeDepth)
 885         break;
 886       for (i=0; i < (ssize_t) node_info->number_unique; i++)
 887       {
 888         SetPixelInfoPacket(image,&node_info->list[i],&target);
 889         if (IsPixelInfoEquivalent(&pixel,&target) != MagickFalse)
 890           break;
 891       }
 892       if (i < (ssize_t) node_info->number_unique)
 893         node_info->list[i].count++;
 894       else
 895         {
 896           /*
 897             Add this unique color to the color list.
 898           */
 899           if (node_info->number_unique == 0)
 900             node_info->list=(PixelPacket *) AcquireMagickMemory(
 901               sizeof(*node_info->list));
 902           else
 903             node_info->list=(PixelPacket *) ResizeQuantumMemory(node_info->list,
 904               (size_t) (i+1),sizeof(*node_info->list));
 905           if (node_info->list == (PixelPacket *) NULL)
 906             {
 907               (void) ThrowMagickException(exception,GetMagickModule(),
 908                 ResourceLimitError,"MemoryAllocationFailed","`%s'",
 909                 image->filename);
 910               break;
 911             }
 912           node_info->list[i].red=GetPixelRed(image,p);
 913           node_info->list[i].green=GetPixelGreen(image,p);
 914           node_info->list[i].blue=GetPixelBlue(image,p);
 915           if (image->colorspace == CMYKColorspace)
 916             node_info->list[i].black=GetPixelBlack(image,p);
 917           node_info->list[i].alpha=GetPixelAlpha(image,p);
 918           node_info->list[i].count=1;
 919           node_info->number_unique++;
 920           cube_info->colors++;
 921           if (cube_info->colors > 256)
 922             break;
 923         }
 924       p+=GetPixelChannels(image);
 925     }
 926     if (x < (ssize_t) image->columns)
 927       break;
 928   }
 929   image_view=DestroyCacheView(image_view);
 930   cube_info=DestroyCubeInfo(image,cube_info);
 931   return(y < (ssize_t) image->rows ? MagickFalse : MagickTrue);
 932 }
 933 \f
 934 /*
 935 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 936 %                                                                             %
 937 %                                                                             %
 938 %                                                                             %
 939 %     M i n M a x S t r e t c h I m a g e                                     %
 940 %                                                                             %
 941 %                                                                             %
 942 %                                                                             %
 943 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 944 %
 945 %  MinMaxStretchImage() uses the exact minimum and maximum values found in
 946 %  each of the channels given, as the BlackPoint and WhitePoint to linearly
 947 %  stretch the colors (and histogram) of the image.  The stretch points are
 948 %  also moved further inward by the adjustment values given.
 949 %
 950 %  If the adjustment values are both zero this function is equivalent to a
 951 %  perfect normalization (or autolevel) of the image.
 952 %
 953 %  Each channel is stretched independantally of each other (producing color
 954 %  distortion) unless the special 'SyncChannels' flag is also provided in the
 955 %  channels setting. If this flag is present the minimum and maximum point
 956 %  will be extracted from all the given channels, and those channels will be
 957 %  stretched by exactly the same amount (preventing color distortion).
 958 %
 959 %  In the special case that only ONE value is found in a channel of the image
 960 %  that value is not stretched, that value is left as is.
 961 %
 962 %  The 'SyncChannels' is turned on in the 'DefaultChannels' setting by
 963 %  default.
 964 %
 965 %  The format of the MinMaxStretchImage method is:
 966 %
 967 %      MagickBooleanType MinMaxStretchImage(Image *image,const double black,
 968 %        const double white,ExceptionInfo *exception)
 969 %
 970 %  A description of each parameter follows:
 971 %
 972 %    o image: The image to auto-level
 973 %
 974 %    o black, white:  move the black / white point inward from the minimum and
 975 %      maximum points by this color value.
 976 %
 977 %    o exception: return any errors or warnings in this structure.
 978 %
 979 */
 980 MagickExport MagickBooleanType MinMaxStretchImage(Image *image,
 981   const double black,const double white,ExceptionInfo *exception)
 982 {
 983   ChannelType
 984     channel_mask;
 985
 986   double
 987     min,
 988     max;
 989
 990   MagickStatusType
 991     status;
 992
 993   status=MagickTrue;
 994   if (image->sync != MagickFalse)
 995     {
 996       /*
 997         Auto-level all channels equally.
 998       */
 999       (void) GetImageRange(image,&min,&max,exception);
1000       min+=black;
1001       max-=white;
1002       if (fabs(min-max) >= MagickEpsilon)
1003         status&=LevelImage(image,min,max,1.0,exception);
1004       return(status != 0 ? MagickTrue : MagickFalse);
1005     }
1006   /*
1007     Auto-level each channel separately.
1008   */
1009   if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
1010     {
1011       channel_mask=SetPixelChannelMask(image,RedChannel);
1012       (void) GetImageRange(image,&min,&max,exception);
1013       min+=black;
1014       max-=white;
1015       if (fabs(min-max) >= MagickEpsilon)
1016         status&=LevelImage(image,min,max,1.0,exception);
1017       (void) SetPixelChannelMask(image,channel_mask);
1018     }
1019   if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
1020     {
1021       channel_mask=SetPixelChannelMask(image,GreenChannel);
1022       (void) GetImageRange(image,&min,&max,exception);
1023       min+=black;
1024       max-=white;
1025       if (fabs(min-max) >= MagickEpsilon)
1026         status&=LevelImage(image,min,max,1.0,exception);
1027       (void) SetPixelChannelMask(image,channel_mask);
1028     }
1029   if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
1030     {
1031       channel_mask=SetPixelChannelMask(image,BlueChannel);
1032       (void) GetImageRange(image,&min,&max,exception);
1033       min+=black;
1034       max-=white;
1035       if (fabs(min-max) >= MagickEpsilon)
1036         status&=LevelImage(image,min,max,1.0,exception);
1037       (void) SetPixelChannelMask(image,channel_mask);
1038     }
1039   if (((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) &&
1040        (image->colorspace == CMYKColorspace))
1041     {
1042       channel_mask=SetPixelChannelMask(image,BlackChannel);
1043       (void) GetImageRange(image,&min,&max,exception);
1044       min+=black;
1045       max-=white;
1046       if (fabs(min-max) >= MagickEpsilon)
1047         status&=LevelImage(image,min,max,1.0,exception);
1048       (void) SetPixelChannelMask(image,channel_mask);
1049     }
1050   if (((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) &&
1051        (image->matte == MagickTrue))
1052     {
1053       channel_mask=SetPixelChannelMask(image,AlphaChannel);
1054       (void) GetImageRange(image,&min,&max,exception);
1055       min+=black;
1056       max-=white;
1057       if (fabs(min-max) >= MagickEpsilon)
1058         status&=LevelImage(image,min,max,1.0,exception);
1059       (void) SetPixelChannelMask(image,channel_mask);
1060     }
1061   return(status != 0 ? MagickTrue : MagickFalse);
1062 }
1063 \f
1064 /*
1065 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1066 %                                                                             %
1067 %                                                                             %
1068 %                                                                             %
1069 %  G e t N u m b e r C o l o r s                                              %
1070 %                                                                             %
1071 %                                                                             %
1072 %                                                                             %
1073 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1074 %
1075 %  GetNumberColors() returns the number of unique colors in an image.
1076 %
1077 %  The format of the GetNumberColors method is:
1078 %
1079 %      size_t GetNumberColors(const Image *image,FILE *file,
1080 %        ExceptionInfo *exception)
1081 %
1082 %  A description of each parameter follows.
1083 %
1084 %    o image: the image.
1085 %
1086 %    o file:  Write a histogram of the color distribution to this file handle.
1087 %
1088 %    o exception: return any errors or warnings in this structure.
1089 %
1090 */
1091
1092 #if defined(__cplusplus) || defined(c_plusplus)
1093 extern "C" {
1094 #endif
1095
1096 static int HistogramCompare(const void *x,const void *y)
1097 {
1098   const PixelPacket
1099     *color_1,
1100     *color_2;
1101
1102   color_1=(const PixelPacket *) x;
1103   color_2=(const PixelPacket *) y;
1104   if (color_2->red != color_1->red)
1105     return((int) color_1->red-(int) color_2->red);
1106   if (color_2->green != color_1->green)
1107     return((int) color_1->green-(int) color_2->green);
1108   if (color_2->blue != color_1->blue)
1109     return((int) color_1->blue-(int) color_2->blue);
1110   return((int) color_2->count-(int) color_1->count);
1111 }
1112
1113 #if defined(__cplusplus) || defined(c_plusplus)
1114 }
1115 #endif
1116
1117 MagickExport size_t GetNumberColors(const Image *image,FILE *file,
1118   ExceptionInfo *exception)
1119 {
1120 #define HistogramImageTag  "Histogram/Image"
1121
1122   char
1123     color[MaxTextExtent],
1124     hex[MaxTextExtent],
1125     tuple[MaxTextExtent];
1126
1127   PixelPacket
1128     *histogram;
1129
1130   MagickBooleanType
1131     status;
1132
1133   PixelInfo
1134     pixel;
1135
1136   register PixelPacket
1137     *p;
1138
1139   register ssize_t
1140     i;
1141
1142   size_t
1143     number_colors;
1144
1145   number_colors=0;
1146   if (file == (FILE *) NULL)
1147     {
1148       CubeInfo
1149         *cube_info;
1150
1151       cube_info=ClassifyImageColors(image,exception);
1152       if (cube_info != (CubeInfo *) NULL)
1153         number_colors=cube_info->colors;
1154       cube_info=DestroyCubeInfo(image,cube_info);
1155       return(number_colors);
1156     }
1157   histogram=GetImageHistogram(image,&number_colors,exception);
1158   if (histogram == (PixelPacket *) NULL)
1159     return(number_colors);
1160   qsort((void *) histogram,(size_t) number_colors,sizeof(*histogram),
1161     HistogramCompare);
1162   GetPixelInfo(image,&pixel);
1163   p=histogram;
1164   status=MagickTrue;
1165   for (i=0; i < (ssize_t) number_colors; i++)
1166   {
1167     SetPixelInfoPacket(image,p,&pixel);
1168     (void) CopyMagickString(tuple,"(",MaxTextExtent);
1169     ConcatenateColorComponent(&pixel,RedPixelChannel,X11Compliance,tuple);
1170     (void) ConcatenateMagickString(tuple,",",MaxTextExtent);
1171     ConcatenateColorComponent(&pixel,GreenPixelChannel,X11Compliance,tuple);
1172     (void) ConcatenateMagickString(tuple,",",MaxTextExtent);
1173     ConcatenateColorComponent(&pixel,BluePixelChannel,X11Compliance,tuple);
1174     if (pixel.colorspace == CMYKColorspace)
1175       {
1176         (void) ConcatenateMagickString(tuple,",",MaxTextExtent);
1177         ConcatenateColorComponent(&pixel,BlackPixelChannel,X11Compliance,
1178           tuple);
1179       }
1180     if (pixel.matte != MagickFalse)
1181       {
1182         (void) ConcatenateMagickString(tuple,",",MaxTextExtent);
1183         ConcatenateColorComponent(&pixel,AlphaPixelChannel,X11Compliance,
1184           tuple);
1185       }
1186     (void) ConcatenateMagickString(tuple,")",MaxTextExtent);
1187     (void) QueryMagickColorname(image,&pixel,SVGCompliance,color,exception);
1188     GetColorTuple(&pixel,MagickTrue,hex);
1189     (void) FormatLocaleFile(file,"%10" MagickSizeFormat,p->count);
1190     (void) FormatLocaleFile(file,": %s %s %s\n",tuple,hex,color);
1191     if (image->progress_monitor != (MagickProgressMonitor) NULL)
1192       {
1193         MagickBooleanType
1194           proceed;
1195
1196         proceed=SetImageProgress(image,HistogramImageTag,(MagickOffsetType) i,
1197           number_colors);
1198         if (proceed == MagickFalse)
1199           status=MagickFalse;
1200       }
1201     p++;
1202   }
1203   (void) fflush(file);
1204   histogram=(PixelPacket *) RelinquishMagickMemory(histogram);
1205   if (status == MagickFalse)
1206     return(0);
1207   return(number_colors);
1208 }
1209 \f
1210 /*
1211 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1212 %                                                                             %
1213 %                                                                             %
1214 %                                                                             %
1215 %  U n i q u e I m a g e C o l o r s                                          %
1216 %                                                                             %
1217 %                                                                             %
1218 %                                                                             %
1219 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1220 %
1221 %  UniqueImageColors() returns the unique colors of an image.
1222 %
1223 %  The format of the UniqueImageColors method is:
1224 %
1225 %      Image *UniqueImageColors(const Image *image,ExceptionInfo *exception)
1226 %
1227 %  A description of each parameter follows.
1228 %
1229 %    o image: the image.
1230 %
1231 %    o exception: return any errors or warnings in this structure.
1232 %
1233 */
1234
1235 static void UniqueColorsToImage(Image *unique_image,CacheView *unique_view,
1236   CubeInfo *cube_info,const NodeInfo *node_info,ExceptionInfo *exception)
1237 {
1238 #define UniqueColorsImageTag  "UniqueColors/Image"
1239
1240   MagickBooleanType
1241     status;
1242
1243   register ssize_t
1244     i;
1245
1246   size_t
1247     number_children;
1248
1249   /*
1250     Traverse any children.
1251   */
1252   number_children=unique_image->matte == MagickFalse ? 8UL : 16UL;
1253   for (i=0; i < (ssize_t) number_children; i++)
1254     if (node_info->child[i] != (NodeInfo *) NULL)
1255       UniqueColorsToImage(unique_image,unique_view,cube_info,
1256         node_info->child[i],exception);
1257   if (node_info->level == (MaxTreeDepth-1))
1258     {
1259       register PixelPacket
1260         *p;
1261
1262       register Quantum
1263         *restrict q;
1264
1265       status=MagickTrue;
1266       p=node_info->list;
1267       for (i=0; i < (ssize_t) node_info->number_unique; i++)
1268       {
1269         q=QueueCacheViewAuthenticPixels(unique_view,cube_info->x,0,1,1,
1270           exception);
1271         if (q == (const Quantum *) NULL)
1272           continue;
1273         SetPixelRed(unique_image,p->red,q);
1274         SetPixelGreen(unique_image,p->green,q);
1275         SetPixelBlue(unique_image,p->blue,q);
1276         SetPixelAlpha(unique_image,p->alpha,q);
1277         if (unique_image->colorspace == CMYKColorspace)
1278           SetPixelBlack(unique_image,p->black,q);
1279         if (SyncCacheViewAuthenticPixels(unique_view,exception) == MagickFalse)
1280           break;
1281         cube_info->x++;
1282         p++;
1283       }
1284       if (unique_image->progress_monitor != (MagickProgressMonitor) NULL)
1285         {
1286           MagickBooleanType
1287             proceed;
1288
1289           proceed=SetImageProgress(unique_image,UniqueColorsImageTag,
1290             cube_info->progress,cube_info->colors);
1291           if (proceed == MagickFalse)
1292             status=MagickFalse;
1293         }
1294       cube_info->progress++;
1295       if (status == MagickFalse)
1296         return;
1297     }
1298 }
1299
1300 MagickExport Image *UniqueImageColors(const Image *image,
1301   ExceptionInfo *exception)
1302 {
1303   CacheView
1304     *unique_view;
1305
1306   CubeInfo
1307     *cube_info;
1308
1309   Image
1310     *unique_image;
1311
1312   cube_info=ClassifyImageColors(image,exception);
1313   if (cube_info == (CubeInfo *) NULL)
1314     return((Image *) NULL);
1315   unique_image=CloneImage(image,cube_info->colors,1,MagickTrue,exception);
1316   if (unique_image == (Image *) NULL)
1317     return(unique_image);
1318   if (SetImageStorageClass(unique_image,DirectClass,exception) == MagickFalse)
1319     {
1320       unique_image=DestroyImage(unique_image);
1321       return((Image *) NULL);
1322     }
1323   unique_view=AcquireCacheView(unique_image);
1324   UniqueColorsToImage(unique_image,unique_view,cube_info,cube_info->root,
1325     exception);
1326   unique_view=DestroyCacheView(unique_view);
1327   if (cube_info->colors < MaxColormapSize)
1328     {
1329       QuantizeInfo
1330         *quantize_info;
1331
1332       quantize_info=AcquireQuantizeInfo((ImageInfo *) NULL);
1333       quantize_info->number_colors=MaxColormapSize;
1334       quantize_info->dither=MagickFalse;
1335       quantize_info->tree_depth=8;
1336       (void) QuantizeImage(quantize_info,unique_image);
1337       quantize_info=DestroyQuantizeInfo(quantize_info);
1338     }
1339   cube_info=DestroyCubeInfo(image,cube_info);
1340   return(unique_image);
1341 }