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