granicus.if.org Git - imagemagick/blob - coders/fits.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                        FFFFF  IIIII  TTTTT  SSSSS                           %
   7 %                        F        I      T    SS                              %
   8 %                        FFF      I      T     SSS                            %
   9 %                        F        I      T       SS                           %
  10 %                        F      IIIII    T    SSSSS                           %
  11 %                                                                             %
  12 %                                                                             %
  13 %            Read/Write Flexible Image Transport System Images.               %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/attribute.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/color-private.h"
  48 #include "MagickCore/colorspace.h"
  49 #include "MagickCore/colorspace-private.h"
  50 #include "MagickCore/constitute.h"
  51 #include "MagickCore/exception.h"
  52 #include "MagickCore/exception-private.h"
  53 #include "MagickCore/image.h"
  54 #include "MagickCore/image-private.h"
  55 #include "MagickCore/list.h"
  56 #include "MagickCore/magick.h"
  57 #include "MagickCore/memory_.h"
  58 #include "MagickCore/module.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/property.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/statistic.h"
  66 #include "MagickCore/string_.h"
  67 #include "MagickCore/string-private.h"
  68 #include "MagickCore/module.h"
  69 \f
  70 /*
  71   Forward declarations.
  72 */
  73 #define FITSBlocksize  2880UL
  74 \f
  75 /*
  76   Forward declarations.
  77 */
  78 static MagickBooleanType
  79   WriteFITSImage(const ImageInfo *,Image *);
  80 \f
  81 /*
  82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  83 %                                                                             %
  84 %                                                                             %
  85 %                                                                             %
  86 %   I s F I T S                                                               %
  87 %                                                                             %
  88 %                                                                             %
  89 %                                                                             %
  90 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  91 %
  92 %  IsFITS() returns MagickTrue if the image format type, identified by the
  93 %  magick string, is FITS.
  94 %
  95 %  The format of the IsFITS method is:
  96 %
  97 %      MagickBooleanType IsFITS(const unsigned char *magick,const size_t length)
  98 %
  99 %  A description of each parameter follows:
 100 %
 101 %    o magick: compare image format pattern against these bytes.
 102 %
 103 %    o length: Specifies the length of the magick string.
 104 %
 105 */
 106 static MagickBooleanType IsFITS(const unsigned char *magick,const size_t length)
 107 {
 108   if (length < 6)
 109     return(MagickFalse);
 110   if (LocaleNCompare((const char *) magick,"IT0",3) == 0)
 111     return(MagickTrue);
 112   if (LocaleNCompare((const char *) magick,"SIMPLE",6) == 0)
 113     return(MagickTrue);
 114   return(MagickFalse);
 115 }
 116 \f
 117 /*
 118 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 119 %                                                                             %
 120 %                                                                             %
 121 %                                                                             %
 122 %   R e a d F I T S I m a g e                                                 %
 123 %                                                                             %
 124 %                                                                             %
 125 %                                                                             %
 126 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 127 %
 128 %  ReadFITSImage() reads a FITS image file and returns it.  It allocates the
 129 %  memory necessary for the new Image structure and returns a pointer to the
 130 %  new image.
 131 %
 132 %  The format of the ReadFITSImage method is:
 133 %
 134 %      Image *ReadFITSImage(const ImageInfo *image_info,
 135 %        ExceptionInfo *exception)
 136 %
 137 %  A description of each parameter follows:
 138 %
 139 %    o image_info: the image info.
 140 %
 141 %    o exception: return any errors or warnings in this structure.
 142 %
 143 */
 144
 145 static inline double GetFITSPixel(Image *image,int bits_per_pixel)
 146 {
 147   switch (image->depth >> 3)
 148   {
 149     case 1:
 150       return((double) ReadBlobByte(image));
 151     case 2:
 152       return((double) ((short) ReadBlobShort(image)));
 153     case 4:
 154     {
 155       if (bits_per_pixel > 0)
 156         return((double) ((int) ReadBlobLong(image)));
 157       return((double) ReadBlobFloat(image));
 158     }
 159     case 8:
 160     {
 161       if (bits_per_pixel > 0)
 162         return((double) ((MagickOffsetType) ReadBlobLongLong(image)));
 163     }
 164     default:
 165       break;
 166   }
 167   return(ReadBlobDouble(image));
 168 }
 169
 170 static void GetFITSPixelExtrema(Image *image,const int bits_per_pixel,
 171   double *minima,double *maxima)
 172 {
 173   double
 174     pixel;
 175
 176   MagickOffsetType
 177     offset;
 178
 179   MagickSizeType
 180     number_pixels;
 181
 182   register MagickOffsetType
 183     i;
 184
 185   offset=TellBlob(image);
 186   number_pixels=(MagickSizeType) image->columns*image->rows;
 187   *minima=GetFITSPixel(image,bits_per_pixel);
 188   *maxima=(*minima);
 189   for (i=1; i < (MagickOffsetType) number_pixels; i++)
 190   {
 191     pixel=GetFITSPixel(image,bits_per_pixel);
 192     if (pixel < *minima)
 193       *minima=pixel;
 194     if (pixel > *maxima)
 195       *maxima=pixel;
 196   }
 197   (void) SeekBlob(image,offset,SEEK_SET);
 198 }
 199
 200 static inline double GetFITSPixelRange(const size_t depth)
 201 {
 202   return((double) ((MagickOffsetType) GetQuantumRange(depth)));
 203 }
 204
 205 static void SetFITSUnsignedPixels(const size_t length,
 206   const size_t bits_per_pixel,unsigned char *pixels)
 207 {
 208   register ssize_t
 209     i;
 210
 211   for (i=0; i < (ssize_t) length; i++)
 212   {
 213     *pixels^=0x80;
 214     pixels+=bits_per_pixel >> 3;
 215   }
 216 }
 217
 218 static Image *ReadFITSImage(const ImageInfo *image_info,
 219   ExceptionInfo *exception)
 220 {
 221   typedef struct _FITSInfo
 222   {
 223     MagickBooleanType
 224       extend,
 225       simple;
 226
 227     int
 228       bits_per_pixel,
 229       columns,
 230       rows,
 231       number_axes,
 232       number_planes;
 233
 234     double
 235       min_data,
 236       max_data,
 237       zero,
 238       scale;
 239
 240     EndianType
 241       endian;
 242   } FITSInfo;
 243
 244   char
 245     *comment,
 246     keyword[9],
 247     property[MaxTextExtent],
 248     value[73];
 249
 250   double
 251     pixel,
 252     scale;
 253
 254   FITSInfo
 255     fits_info;
 256
 257   Image
 258     *image;
 259
 260   int
 261     c;
 262
 263   MagickBooleanType
 264     status;
 265
 266   MagickSizeType
 267     number_pixels;
 268
 269   register ssize_t
 270     i,
 271     x;
 272
 273   register Quantum
 274     *q;
 275
 276   ssize_t
 277     count,
 278     scene,
 279     y;
 280
 281   /*
 282     Open image file.
 283   */
 284   assert(image_info != (const ImageInfo *) NULL);
 285   assert(image_info->signature == MagickSignature);
 286   if (image_info->debug != MagickFalse)
 287     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 288       image_info->filename);
 289   assert(exception != (ExceptionInfo *) NULL);
 290   assert(exception->signature == MagickSignature);
 291   image=AcquireImage(image_info);
 292   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 293   if (status == MagickFalse)
 294     {
 295       image=DestroyImageList(image);
 296       return((Image *) NULL);
 297     }
 298   /*
 299     Initialize image header.
 300   */
 301   (void) ResetMagickMemory(&fits_info,0,sizeof(fits_info));
 302   fits_info.extend=MagickFalse;
 303   fits_info.simple=MagickFalse;
 304   fits_info.bits_per_pixel=8;
 305   fits_info.columns=1;
 306   fits_info.rows=1;
 307   fits_info.rows=1;
 308   fits_info.number_planes=1;
 309   fits_info.min_data=0.0;
 310   fits_info.max_data=0.0;
 311   fits_info.zero=0.0;
 312   fits_info.scale=1.0;
 313   fits_info.endian=MSBEndian;
 314   /*
 315     Decode image header.
 316   */
 317   for (comment=(char *) NULL; EOFBlob(image) == MagickFalse; )
 318   {
 319     for ( ; EOFBlob(image) == MagickFalse; )
 320     {
 321       register char
 322         *p;
 323
 324       count=ReadBlob(image,8,(unsigned char *) keyword);
 325       if (count != 8)
 326         break;
 327       for (i=0; i < 8; i++)
 328       {
 329         if (isspace((int) ((unsigned char) keyword[i])) != 0)
 330           break;
 331         keyword[i]=tolower((int) ((unsigned char) keyword[i]));
 332       }
 333       keyword[i]='\0';
 334       count=ReadBlob(image,72,(unsigned char *) value);
 335       if (count != 72)
 336         break;
 337       value[72]='\0';
 338       p=value;
 339       if (*p == '=')
 340         {
 341           p+=2;
 342           while (isspace((int) ((unsigned char) *p)) != 0)
 343             p++;
 344         }
 345       if (LocaleCompare(keyword,"end") == 0)
 346         break;
 347       if (LocaleCompare(keyword,"extend") == 0)
 348         fits_info.extend=(*p == 'T') || (*p == 't') ? MagickTrue : MagickFalse;
 349       if (LocaleCompare(keyword,"simple") == 0)
 350         fits_info.simple=(*p == 'T') || (*p == 't') ? MagickTrue : MagickFalse;
 351       if (LocaleCompare(keyword,"bitpix") == 0)
 352         fits_info.bits_per_pixel=StringToLong(p);
 353       if (LocaleCompare(keyword,"naxis") == 0)
 354         fits_info.number_axes=StringToLong(p);
 355       if (LocaleCompare(keyword,"naxis1") == 0)
 356         fits_info.columns=StringToLong(p);
 357       if (LocaleCompare(keyword,"naxis2") == 0)
 358         fits_info.rows=StringToLong(p);
 359       if (LocaleCompare(keyword,"naxis3") == 0)
 360         fits_info.number_planes=StringToLong(p);
 361       if (LocaleCompare(keyword,"datamax") == 0)
 362         fits_info.max_data=InterpretLocaleValue(p,(char **) NULL);
 363       if (LocaleCompare(keyword,"datamin") == 0)
 364         fits_info.min_data=InterpretLocaleValue(p,(char **) NULL);
 365       if (LocaleCompare(keyword,"bzero") == 0)
 366         fits_info.zero=InterpretLocaleValue(p,(char **) NULL);
 367       if (LocaleCompare(keyword,"bscale") == 0)
 368         fits_info.scale=InterpretLocaleValue(p,(char **) NULL);
 369       if (LocaleCompare(keyword,"comment") == 0)
 370         {
 371           if (comment == (char *) NULL)
 372             comment=ConstantString(p);
 373           else
 374             (void) ConcatenateString(&comment,p);
 375         }
 376       if (LocaleCompare(keyword,"xendian") == 0)
 377         {
 378           if (LocaleNCompare(p,"big",3) == 0)
 379             fits_info.endian=MSBEndian;
 380           else
 381             fits_info.endian=LSBEndian;
 382         }
 383       (void) FormatLocaleString(property,MaxTextExtent,"fits:%s",keyword);
 384       (void) SetImageProperty(image,property,p);
 385     }
 386     c=0;
 387     while (((TellBlob(image) % FITSBlocksize) != 0) && (c != EOF))
 388       c=ReadBlobByte(image);
 389     if (fits_info.extend == MagickFalse)
 390       break;
 391     number_pixels=(MagickSizeType) fits_info.columns*fits_info.rows;
 392     if ((fits_info.simple != MagickFalse) && (fits_info.number_axes >= 1) &&
 393         (fits_info.number_axes <= 4) && (number_pixels != 0))
 394       break;
 395   }
 396   /*
 397     Verify that required image information is defined.
 398   */
 399   if (comment != (char *) NULL)
 400     {
 401       (void) SetImageProperty(image,"comment",comment);
 402       comment=DestroyString(comment);
 403     }
 404   if (EOFBlob(image) != MagickFalse)
 405     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 406       image->filename);
 407   number_pixels=(MagickSizeType) fits_info.columns*fits_info.rows;
 408   if ((fits_info.simple == MagickFalse) || (fits_info.number_axes < 1) ||
 409       (fits_info.number_axes > 4) || (number_pixels == 0))
 410     ThrowReaderException(CorruptImageError,"ImageTypeNotSupported");
 411   for (scene=0; scene < (ssize_t) fits_info.number_planes; scene++)
 412   {
 413     image->columns=(size_t) fits_info.columns;
 414     image->rows=(size_t) fits_info.rows;
 415     image->depth=(size_t) (fits_info.bits_per_pixel < 0 ? -1 : 1)*
 416       fits_info.bits_per_pixel;
 417     image->endian=fits_info.endian;
 418     image->scene=(size_t) scene;
 419     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 420       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 421         break;
 422     /*
 423       Initialize image structure.
 424     */
 425     if ((fits_info.min_data != 0.0) || (fits_info.max_data != 0.0))
 426       {
 427         if ((fits_info.bits_per_pixel != 0) && (fits_info.max_data == 0.0))
 428           fits_info.max_data=GetFITSPixelRange((size_t)
 429             fits_info.bits_per_pixel);
 430       }
 431     else
 432       GetFITSPixelExtrema(image,fits_info.bits_per_pixel,&fits_info.min_data,
 433         &fits_info.max_data);
 434     /*
 435       Convert FITS pixels to pixel packets.
 436     */
 437     scale=(double) QuantumRange/(fits_info.scale*(fits_info.max_data-
 438       fits_info.min_data)+fits_info.zero);
 439     for (y=(ssize_t) image->rows-1; y >= 0; y--)
 440     {
 441       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 442       if (q == (const Quantum *) NULL)
 443         break;
 444       for (x=0; x < (ssize_t) image->columns; x++)
 445       {
 446         pixel=GetFITSPixel(image,fits_info.bits_per_pixel);
 447         SetPixelRed(image,ClampToQuantum(scale*(fits_info.scale*
 448           (pixel-fits_info.min_data)+fits_info.zero)),q);
 449         SetPixelGreen(image,GetPixelRed(image,q),q);
 450         SetPixelBlue(image,GetPixelRed(image,q),q);
 451         q+=GetPixelChannels(image);
 452       }
 453       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 454         break;
 455       if (image->previous == (Image *) NULL)
 456         {
 457           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 458             image->rows);
 459           if (status == MagickFalse)
 460             break;
 461         }
 462     }
 463     if (EOFBlob(image) != MagickFalse)
 464       {
 465         ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 466           image->filename);
 467         break;
 468       }
 469     /*
 470       Proceed to next image.
 471     */
 472     if (image_info->number_scenes != 0)
 473       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 474         break;
 475     if (scene < (ssize_t) (fits_info.number_planes-1))
 476       {
 477         /*
 478           Allocate next image structure.
 479         */
 480         AcquireNextImage(image_info,image);
 481         if (GetNextImageInList(image) == (Image *) NULL)
 482           {
 483             image=DestroyImageList(image);
 484             return((Image *) NULL);
 485           }
 486         image=SyncNextImageInList(image);
 487         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
 488           GetBlobSize(image));
 489         if (status == MagickFalse)
 490           break;
 491       }
 492   }
 493   (void) CloseBlob(image);
 494   return(GetFirstImageInList(image));
 495 }
 496 \f
 497 /*
 498 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 499 %                                                                             %
 500 %                                                                             %
 501 %                                                                             %
 502 %   R e g i s t e r F I T S I m a g e                                         %
 503 %                                                                             %
 504 %                                                                             %
 505 %                                                                             %
 506 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 507 %
 508 %  RegisterFITSImage() adds attributes for the FITS image format to
 509 %  the list of supported formats.  The attributes include the image format
 510 %  tag, a method to read and/or write the format, whether the format
 511 %  supports the saving of more than one frame to the same file or blob,
 512 %  whether the format supports native in-memory I/O, and a brief
 513 %  description of the format.
 514 %
 515 %  The format of the RegisterFITSImage method is:
 516 %
 517 %      size_t RegisterFITSImage(void)
 518 %
 519 */
 520 ModuleExport size_t RegisterFITSImage(void)
 521 {
 522   MagickInfo
 523     *entry;
 524
 525   entry=SetMagickInfo("FITS");
 526   entry->decoder=(DecodeImageHandler *) ReadFITSImage;
 527   entry->encoder=(EncodeImageHandler *) WriteFITSImage;
 528   entry->magick=(IsImageFormatHandler *) IsFITS;
 529   entry->adjoin=MagickFalse;
 530   entry->seekable_stream=MagickTrue;
 531   entry->description=ConstantString("Flexible Image Transport System");
 532   entry->module=ConstantString("FITS");
 533   (void) RegisterMagickInfo(entry);
 534   entry=SetMagickInfo("FTS");
 535   entry->decoder=(DecodeImageHandler *) ReadFITSImage;
 536   entry->encoder=(EncodeImageHandler *) WriteFITSImage;
 537   entry->magick=(IsImageFormatHandler *) IsFITS;
 538   entry->adjoin=MagickFalse;
 539   entry->seekable_stream=MagickTrue;
 540   entry->description=ConstantString("Flexible Image Transport System");
 541   entry->module=ConstantString("FTS");
 542   (void) RegisterMagickInfo(entry);
 543   return(MagickImageCoderSignature);
 544 }
 545 \f
 546 /*
 547 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 548 %                                                                             %
 549 %                                                                             %
 550 %                                                                             %
 551 %   U n r e g i s t e r F I T S I m a g e                                     %
 552 %                                                                             %
 553 %                                                                             %
 554 %                                                                             %
 555 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 556 %
 557 %  UnregisterFITSImage() removes format registrations made by the
 558 %  FITS module from the list of supported formats.
 559 %
 560 %  The format of the UnregisterFITSImage method is:
 561 %
 562 %      UnregisterFITSImage(void)
 563 %
 564 */
 565 ModuleExport void UnregisterFITSImage(void)
 566 {
 567   (void) UnregisterMagickInfo("FITS");
 568   (void) UnregisterMagickInfo("FTS");
 569 }
 570 \f
 571 /*
 572 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 573 %                                                                             %
 574 %                                                                             %
 575 %                                                                             %
 576 %   W r i t e F I T S I m a g e                                               %
 577 %                                                                             %
 578 %                                                                             %
 579 %                                                                             %
 580 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 581 %
 582 %  WriteFITSImage() writes a Flexible Image Transport System image to a
 583 %  file as gray scale intensities [0..255].
 584 %
 585 %  The format of the WriteFITSImage method is:
 586 %
 587 %      MagickBooleanType WriteFITSImage(const ImageInfo *image_info,
 588 %        Image *image)
 589 %
 590 %  A description of each parameter follows.
 591 %
 592 %    o image_info: the image info.
 593 %
 594 %    o image:  The image.
 595 %
 596 */
 597 static MagickBooleanType WriteFITSImage(const ImageInfo *image_info,
 598   Image *image)
 599 {
 600   char
 601     header[FITSBlocksize],
 602     *fits_info;
 603
 604   MagickBooleanType
 605     status;
 606
 607   QuantumInfo
 608     *quantum_info;
 609
 610   register const Quantum
 611     *p;
 612
 613   size_t
 614     length;
 615
 616   ssize_t
 617     count,
 618     offset,
 619     y;
 620
 621   unsigned char
 622     *pixels;
 623
 624   /*
 625     Open output image file.
 626   */
 627   assert(image_info != (const ImageInfo *) NULL);
 628   assert(image_info->signature == MagickSignature);
 629   assert(image != (Image *) NULL);
 630   assert(image->signature == MagickSignature);
 631   if (image->debug != MagickFalse)
 632     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 633   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 634   if (status == MagickFalse)
 635     return(status);
 636   if (IsRGBColorspace(image->colorspace) == MagickFalse)
 637     (void) TransformImageColorspace(image,RGBColorspace);
 638   /*
 639     Allocate image memory.
 640   */
 641   fits_info=(char *) AcquireQuantumMemory(FITSBlocksize,sizeof(*fits_info));
 642   if (fits_info == (char *) NULL)
 643     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 644   (void) ResetMagickMemory(fits_info,' ',FITSBlocksize*sizeof(*fits_info));
 645   /*
 646     Initialize image header.
 647   */
 648   image->depth=GetImageQuantumDepth(image,MagickFalse);
 649   quantum_info=AcquireQuantumInfo((const ImageInfo *) NULL,image);
 650   if (quantum_info == (QuantumInfo *) NULL)
 651     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 652   offset=0;
 653   (void) FormatLocaleString(header,FITSBlocksize,
 654     "SIMPLE  =                    T");
 655   (void) strncpy(fits_info+offset,header,strlen(header));
 656   offset+=80;
 657   (void) FormatLocaleString(header,FITSBlocksize,"BITPIX  =           %10ld",
 658     (long) (quantum_info->format == FloatingPointQuantumFormat ? -1 : 1)*
 659     image->depth);
 660   (void) strncpy(fits_info+offset,header,strlen(header));
 661   offset+=80;
 662   (void) FormatLocaleString(header,FITSBlocksize,"NAXIS   =           %10lu",
 663     IsImageGray(image,&image->exception) != MagickFalse ? 2UL : 3UL);
 664   (void) strncpy(fits_info+offset,header,strlen(header));
 665   offset+=80;
 666   (void) FormatLocaleString(header,FITSBlocksize,"NAXIS1  =           %10lu",
 667     (unsigned long) image->columns);
 668   (void) strncpy(fits_info+offset,header,strlen(header));
 669   offset+=80;
 670   (void) FormatLocaleString(header,FITSBlocksize,"NAXIS2  =           %10lu",
 671     (unsigned long) image->rows);
 672   (void) strncpy(fits_info+offset,header,strlen(header));
 673   offset+=80;
 674   if (IsImageGray(image,&image->exception) == MagickFalse)
 675     {
 676       (void) FormatLocaleString(header,FITSBlocksize,
 677         "NAXIS3  =           %10lu",3UL);
 678       (void) strncpy(fits_info+offset,header,strlen(header));
 679       offset+=80;
 680     }
 681   (void) FormatLocaleString(header,FITSBlocksize,"BSCALE  =         %E",1.0);
 682   (void) strncpy(fits_info+offset,header,strlen(header));
 683   offset+=80;
 684   (void) FormatLocaleString(header,FITSBlocksize,"BZERO   =         %E",
 685     image->depth > 8 ? GetFITSPixelRange(image->depth) : 0.0);
 686   (void) strncpy(fits_info+offset,header,strlen(header));
 687   offset+=80;
 688   (void) FormatLocaleString(header,FITSBlocksize,"DATAMAX =         %E",
 689     1.0*((MagickOffsetType) GetQuantumRange(image->depth)));
 690   (void) strncpy(fits_info+offset,header,strlen(header));
 691   offset+=80;
 692   (void) FormatLocaleString(header,FITSBlocksize,"DATAMIN =         %E",0.0);
 693   (void) strncpy(fits_info+offset,header,strlen(header));
 694   offset+=80;
 695   if (image->endian == LSBEndian)
 696     {
 697       (void) FormatLocaleString(header,FITSBlocksize,"XENDIAN = 'SMALL'");
 698       (void) strncpy(fits_info+offset,header,strlen(header));
 699       offset+=80;
 700     }
 701   (void) FormatLocaleString(header,FITSBlocksize,"HISTORY %.72s",
 702     GetMagickVersion((size_t *) NULL));
 703   (void) strncpy(fits_info+offset,header,strlen(header));
 704   offset+=80;
 705   (void) strncpy(header,"END",FITSBlocksize);
 706   (void) strncpy(fits_info+offset,header,strlen(header));
 707   offset+=80;
 708   (void) WriteBlob(image,FITSBlocksize,(unsigned char *) fits_info);
 709   /*
 710     Convert image to fits scale PseudoColor class.
 711   */
 712   pixels=GetQuantumPixels(quantum_info);
 713   if (IsImageGray(image,&image->exception) != MagickFalse)
 714     {
 715       length=GetQuantumExtent(image,quantum_info,GrayQuantum);
 716       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 717       {
 718         p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 719         if (p == (const Quantum *) NULL)
 720           break;
 721         length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 722           GrayQuantum,pixels,&image->exception);
 723         if (image->depth == 16)
 724           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 725         if (((image->depth == 32) || (image->depth == 64)) &&
 726             (quantum_info->format != FloatingPointQuantumFormat))
 727           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 728         count=WriteBlob(image,length,pixels);
 729         if (count != (ssize_t) length)
 730           break;
 731         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 732           image->rows);
 733         if (status == MagickFalse)
 734           break;
 735       }
 736     }
 737   else
 738     {
 739       length=GetQuantumExtent(image,quantum_info,RedQuantum);
 740       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 741       {
 742         p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 743         if (p == (const Quantum *) NULL)
 744           break;
 745         length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 746           RedQuantum,pixels,&image->exception);
 747         if (image->depth == 16)
 748           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 749         if (((image->depth == 32) || (image->depth == 64)) &&
 750             (quantum_info->format != FloatingPointQuantumFormat))
 751           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 752         count=WriteBlob(image,length,pixels);
 753         if (count != (ssize_t) length)
 754           break;
 755         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 756           image->rows);
 757         if (status == MagickFalse)
 758           break;
 759       }
 760       length=GetQuantumExtent(image,quantum_info,GreenQuantum);
 761       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 762       {
 763         p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 764         if (p == (const Quantum *) NULL)
 765           break;
 766         length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 767           GreenQuantum,pixels,&image->exception);
 768         if (image->depth == 16)
 769           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 770         if (((image->depth == 32) || (image->depth == 64)) &&
 771             (quantum_info->format != FloatingPointQuantumFormat))
 772           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 773         count=WriteBlob(image,length,pixels);
 774         if (count != (ssize_t) length)
 775           break;
 776         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 777           image->rows);
 778         if (status == MagickFalse)
 779           break;
 780       }
 781       length=GetQuantumExtent(image,quantum_info,BlueQuantum);
 782       for (y=(ssize_t) image->rows-1; y >= 0; y--)
 783       {
 784         p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 785         if (p == (const Quantum *) NULL)
 786           break;
 787         length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
 788           BlueQuantum,pixels,&image->exception);
 789         if (image->depth == 16)
 790           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 791         if (((image->depth == 32) || (image->depth == 64)) &&
 792             (quantum_info->format != FloatingPointQuantumFormat))
 793           SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 794         count=WriteBlob(image,length,pixels);
 795         if (count != (ssize_t) length)
 796           break;
 797         status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 798           image->rows);
 799         if (status == MagickFalse)
 800           break;
 801       }
 802     }
 803   quantum_info=DestroyQuantumInfo(quantum_info);
 804   length=(size_t) (FITSBlocksize-TellBlob(image) % FITSBlocksize);
 805   if (length != 0)
 806     {
 807       (void) ResetMagickMemory(fits_info,0,length*sizeof(*fits_info));
 808       (void) WriteBlob(image,length,(unsigned char *) fits_info);
 809     }
 810   fits_info=DestroyString(fits_info);
 811   (void) CloseBlob(image);
 812   return(MagickTrue);
 813 }