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 1999-2010 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) ((long) 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 unsigned long depth)
 200 {
 201   return((double) ((MagickOffsetType) GetQuantumRange(depth)));
 202 }
 203
 204 static void SetFITSUnsignedPixels(const size_t length,
 205   const unsigned long bits_per_pixel,unsigned char *pixels)
 206 {
 207   register long
 208     i;
 209
 210   for (i=0; i < (long) 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   long
 263     scene,
 264     y;
 265
 266   MagickBooleanType
 267     status;
 268
 269   MagickSizeType
 270     number_pixels;
 271
 272   register long
 273     i,
 274     x;
 275
 276   register PixelPacket
 277     *q;
 278
 279   ssize_t
 280     count;
 281
 282   /*
 283     Open image file.
 284   */
 285   assert(image_info != (const ImageInfo *) NULL);
 286   assert(image_info->signature == MagickSignature);
 287   if (image_info->debug != MagickFalse)
 288     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 289       image_info->filename);
 290   assert(exception != (ExceptionInfo *) NULL);
 291   assert(exception->signature == MagickSignature);
 292   image=AcquireImage(image_info);
 293   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 294   if (status == MagickFalse)
 295     {
 296       image=DestroyImageList(image);
 297       return((Image *) NULL);
 298     }
 299   /*
 300     Initialize image header.
 301   */
 302   (void) ResetMagickMemory(&fits_info,0,sizeof(fits_info));
 303   fits_info.extend=MagickFalse;
 304   fits_info.simple=MagickFalse;
 305   fits_info.bits_per_pixel=8;
 306   fits_info.columns=1;
 307   fits_info.rows=1;
 308   fits_info.rows=1;
 309   fits_info.number_planes=1;
 310   fits_info.min_data=0.0;
 311   fits_info.max_data=0.0;
 312   fits_info.zero=0.0;
 313   fits_info.scale=1.0;
 314   fits_info.endian=MSBEndian;
 315   /*
 316     Decode image header.
 317   */
 318   for (comment=(char *) NULL; EOFBlob(image) == MagickFalse; )
 319   {
 320     for ( ; EOFBlob(image) == MagickFalse; )
 321     {
 322       register char
 323         *p;
 324
 325       count=ReadBlob(image,8,(unsigned char *) keyword);
 326       if (count != 8)
 327         break;
 328       for (i=0; i < 8; i++)
 329       {
 330         if (isspace((int) ((unsigned char) keyword[i])) != 0)
 331           break;
 332         keyword[i]=tolower(keyword[i]);
 333       }
 334       keyword[i]='\0';
 335       count=ReadBlob(image,72,(unsigned char *) value);
 336       if (count != 72)
 337         break;
 338       value[72]='\0';
 339       p=value;
 340       if (*p == '=')
 341         {
 342           p+=2;
 343           while (isspace((int) ((unsigned char) *p)) != 0)
 344             p++;
 345         }
 346       if (LocaleCompare(keyword,"end") == 0)
 347         break;
 348       if (LocaleCompare(keyword,"extend") == 0)
 349         fits_info.extend=(*p == 'T') || (*p == 't') ? MagickTrue : MagickFalse;
 350       if (LocaleCompare(keyword,"simple") == 0)
 351         fits_info.simple=(*p == 'T') || (*p == 't') ? MagickTrue : MagickFalse;
 352       if (LocaleCompare(keyword,"bitpix") == 0)
 353         fits_info.bits_per_pixel=StringToLong(p);
 354       if (LocaleCompare(keyword,"naxis") == 0)
 355         fits_info.number_axes=StringToLong(p);
 356       if (LocaleCompare(keyword,"naxis1") == 0)
 357         fits_info.columns=StringToLong(p);
 358       if (LocaleCompare(keyword,"naxis2") == 0)
 359         fits_info.rows=StringToLong(p);
 360       if (LocaleCompare(keyword,"naxis3") == 0)
 361         fits_info.number_planes=StringToLong(p);
 362       if (LocaleCompare(keyword,"datamax") == 0)
 363         fits_info.max_data=StringToDouble(p);
 364       if (LocaleCompare(keyword,"datamin") == 0)
 365         fits_info.min_data=StringToDouble(p);
 366       if (LocaleCompare(keyword,"bzero") == 0)
 367         fits_info.zero=StringToDouble(p);
 368       if (LocaleCompare(keyword,"bscale") == 0)
 369         fits_info.scale=StringToDouble(p);
 370       if (LocaleCompare(keyword,"comment") == 0)
 371         {
 372           if (comment == (char *) NULL)
 373             comment=ConstantString(p);
 374           else
 375             (void) ConcatenateString(&comment,p);
 376         }
 377       if (LocaleCompare(keyword,"xendian") == 0)
 378         {
 379           if (LocaleNCompare(p,"big",3) == 0)
 380             fits_info.endian=MSBEndian;
 381           else
 382             fits_info.endian=LSBEndian;
 383         }
 384       (void) FormatMagickString(property,MaxTextExtent,"fits:%s",keyword);
 385       (void) SetImageProperty(image,property,p);
 386     }
 387     c=0;
 388     while (((TellBlob(image) % FITSBlocksize) != 0) && (c != EOF))
 389       c=ReadBlobByte(image);
 390     if (fits_info.extend == MagickFalse)
 391       break;
 392     number_pixels=(MagickSizeType) fits_info.columns*fits_info.rows;
 393     if ((fits_info.simple != MagickFalse) && (fits_info.number_axes >= 1) &&
 394         (fits_info.number_axes <= 4) && (number_pixels != 0))
 395       break;
 396   }
 397   /*
 398     Verify that required image information is defined.
 399   */
 400   if (comment != (char *) NULL)
 401     {
 402       (void) SetImageProperty(image,"comment",comment);
 403       comment=DestroyString(comment);
 404     }
 405   if (EOFBlob(image) != MagickFalse)
 406     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 407       image->filename);
 408   number_pixels=(MagickSizeType) fits_info.columns*fits_info.rows;
 409   if ((fits_info.simple == MagickFalse) || (fits_info.number_axes < 1) ||
 410       (fits_info.number_axes > 4) || (number_pixels == 0))
 411     ThrowReaderException(CorruptImageError,"ImageTypeNotSupported");
 412   for (scene=0; scene < (long) fits_info.number_planes; scene++)
 413   {
 414     image->columns=(unsigned long) fits_info.columns;
 415     image->rows=(unsigned long) fits_info.rows;
 416     image->depth=(unsigned long) (fits_info.bits_per_pixel < 0 ? -1 : 1)*
 417       fits_info.bits_per_pixel;
 418     image->endian=fits_info.endian;
 419     image->scene=(unsigned long) scene;
 420     if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
 421       if (image->scene >= (image_info->scene+image_info->number_scenes-1))
 422         break;
 423     /*
 424       Initialize image structure.
 425     */
 426     if ((fits_info.min_data != 0.0) || (fits_info.max_data != 0.0))
 427       {
 428         if ((fits_info.bits_per_pixel != 0) && (fits_info.max_data == 0.0))
 429           fits_info.max_data=GetFITSPixelRange((unsigned long)
 430             fits_info.bits_per_pixel);
 431       }
 432     else
 433       GetFITSPixelExtrema(image,fits_info.bits_per_pixel,&fits_info.min_data,
 434         &fits_info.max_data);
 435     /*
 436       Convert FITS pixels to pixel packets.
 437     */
 438     scale=(double) QuantumRange/(fits_info.scale*(fits_info.max_data-
 439       fits_info.min_data)+fits_info.zero);
 440     for (y=(long) image->rows-1; y >= 0; y--)
 441     {
 442       q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 443       if (q == (PixelPacket *) NULL)
 444         break;
 445       for (x=0; x < (long) image->columns; x++)
 446       {
 447         pixel=GetFITSPixel(image,fits_info.bits_per_pixel);
 448         q->red=(Quantum) RoundToQuantum(scale*(fits_info.scale*(pixel-
 449           fits_info.min_data)+fits_info.zero));
 450         q->green=q->red;
 451         q->blue=q->red;
 452         q++;
 453       }
 454       if (SyncAuthenticPixels(image,exception) == MagickFalse)
 455         break;
 456       if (image->previous == (Image *) NULL)
 457         {
 458           status=SetImageProgress(image,LoadImageTag,y,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 < (long) (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 %      unsigned long RegisterFITSImage(void)
 518 %
 519 */
 520 ModuleExport unsigned long 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   long
 605     y;
 606
 607   MagickBooleanType
 608     status;
 609
 610   QuantumInfo
 611     *quantum_info;
 612
 613   register const PixelPacket
 614     *p;
 615
 616   size_t
 617     length;
 618
 619   ssize_t
 620     count,
 621     offset;
 622
 623   unsigned char
 624     *pixels;
 625
 626   /*
 627     Open output image file.
 628   */
 629   assert(image_info != (const ImageInfo *) NULL);
 630   assert(image_info->signature == MagickSignature);
 631   assert(image != (Image *) NULL);
 632   assert(image->signature == MagickSignature);
 633   if (image->debug != MagickFalse)
 634     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 635   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 636   if (status == MagickFalse)
 637     return(status);
 638   if (image->colorspace != RGBColorspace)
 639     (void) TransformImageColorspace(image,RGBColorspace);
 640   /*
 641     Allocate image memory.
 642   */
 643   fits_info=(char *) AcquireQuantumMemory(FITSBlocksize,sizeof(*fits_info));
 644   if (fits_info == (char *) NULL)
 645     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 646   (void) ResetMagickMemory(fits_info,' ',FITSBlocksize*sizeof(*fits_info));
 647   /*
 648     Initialize image header.
 649   */
 650   image->depth=GetImageQuantumDepth(image,MagickFalse);
 651   quantum_info=AcquireQuantumInfo((const ImageInfo *) NULL,image);
 652   if (quantum_info == (QuantumInfo *) NULL)
 653     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 654   offset=0;
 655   (void) FormatMagickString(header,FITSBlocksize,
 656     "SIMPLE  =                    T");
 657   (void) strncpy(fits_info+offset,header,strlen(header));
 658   offset+=80;
 659   (void) FormatMagickString(header,FITSBlocksize,"BITPIX  =           %10ld",
 660     (quantum_info->format == FloatingPointQuantumFormat ? -1 : 1)*image->depth);
 661   (void) strncpy(fits_info+offset,header,strlen(header));
 662   offset+=80;
 663   (void) FormatMagickString(header,FITSBlocksize,"NAXIS   =           %10lu",
 664     2UL);
 665   (void) strncpy(fits_info+offset,header,strlen(header));
 666   offset+=80;
 667   (void) FormatMagickString(header,FITSBlocksize,"NAXIS1  =           %10lu",
 668     image->columns);
 669   (void) strncpy(fits_info+offset,header,strlen(header));
 670   offset+=80;
 671   (void) FormatMagickString(header,FITSBlocksize,"NAXIS2  =           %10lu",
 672     image->rows);
 673   (void) strncpy(fits_info+offset,header,strlen(header));
 674   offset+=80;
 675   (void) FormatMagickString(header,FITSBlocksize,"BSCALE  =         %E",1.0);
 676   (void) strncpy(fits_info+offset,header,strlen(header));
 677   offset+=80;
 678   (void) FormatMagickString(header,FITSBlocksize,"BZERO   =         %E",
 679     image->depth > 8 ? GetFITSPixelRange(image->depth) : 0.0);
 680   (void) strncpy(fits_info+offset,header,strlen(header));
 681   offset+=80;
 682   (void) FormatMagickString(header,FITSBlocksize,"DATAMAX =         %E",
 683     1.0*((MagickOffsetType) GetQuantumRange(image->depth)));
 684   (void) strncpy(fits_info+offset,header,strlen(header));
 685   offset+=80;
 686   (void) FormatMagickString(header,FITSBlocksize,"DATAMIN =         %E",0.0);
 687   (void) strncpy(fits_info+offset,header,strlen(header));
 688   offset+=80;
 689   if (image->endian == LSBEndian)
 690     {
 691       (void) FormatMagickString(header,FITSBlocksize,"XENDIAN = 'SMALL'");
 692       (void) strncpy(fits_info+offset,header,strlen(header));
 693       offset+=80;
 694     }
 695   (void) FormatMagickString(header,FITSBlocksize,"HISTORY %.72s",
 696     GetMagickVersion((unsigned long *) NULL));
 697   (void) strncpy(fits_info+offset,header,strlen(header));
 698   offset+=80;
 699   (void) strncpy(header,"END",FITSBlocksize);
 700   (void) strncpy(fits_info+offset,header,strlen(header));
 701   offset+=80;
 702   (void) WriteBlob(image,FITSBlocksize,(unsigned char *) fits_info);
 703   /*
 704     Convert image to fits scale PseudoColor class.
 705   */
 706   pixels=GetQuantumPixels(quantum_info);
 707   length=GetQuantumExtent(image,quantum_info,GrayQuantum);
 708   for (y=(long) image->rows-1; y >= 0; y--)
 709   {
 710     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 711     if (p == (const PixelPacket *) NULL)
 712       break;
 713     length=ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
 714       GrayQuantum,pixels,&image->exception);
 715     if (image->depth == 16)
 716       SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 717     if (((image->depth == 32) || (image->depth == 64)) &&
 718         (quantum_info->format != FloatingPointQuantumFormat))
 719       SetFITSUnsignedPixels(image->columns,image->depth,pixels);
 720     count=WriteBlob(image,length,pixels);
 721     if (count != (ssize_t) length)
 722       break;
 723     status=SetImageProgress(image,SaveImageTag,y,image->rows);
 724     if (status == MagickFalse)
 725       break;
 726   }
 727   quantum_info=DestroyQuantumInfo(quantum_info);
 728   length=(size_t) (FITSBlocksize-TellBlob(image) % FITSBlocksize);
 729   if (length != 0)
 730     {
 731       (void) ResetMagickMemory(fits_info,0,length*sizeof(*fits_info));
 732       (void) WriteBlob(image,length,(unsigned char *) fits_info);
 733     }
 734   fits_info=DestroyString(fits_info);
 735   (void) CloseBlob(image);
 736   return(MagickTrue);
 737 }