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2006.05.23 11:03 "Question to TIFF mailing list", by Alexey Aushev

2006.05.23 12:13 "Question to TIFF mailing list", by Gerben Vos

2006.05.23 11:03 "Question to TIFF mailing list", by Alexey Aushev

Hello, the Community! 
 
I'm novice at TIFF coding. Would you say me, please, why my output 24-bit
color image has no this IFD part? Here is the simpliest example of output
of 10x10 image, using TIFFWriteEncodedStrip(). 
 
 
TIFF dump is: 
 
output.tif: 
Magic: 0x4949 <little-endian> Version: 0x2a 
Directory 0: offset 308 (0x134) next 0 (0) 
ImageWidth (256) SHORT (3) 1<10> 
ImageLength (257) SHORT (3) 1<10> 
BitsPerSample (258) SHORT (3) 3<8 8 8> 
Compression (259) SHORT (3) 1<1> 
Photometric (262) SHORT (3) 1<2> 
StripOffsets (273) LONG (4) 10<8 38 68 98 128 158 188 218 248 278> 
SamplesPerPixel (277) SHORT (3) 1<3> 
RowsPerStrip (278) SHORT (3) 1<1> 
StripByteCounts (279) LONG (4) 10<30 30 30 30 30 30 30 30 30 30> 
PlanarConfig (284) SHORT (3) 1<1> 
 
 
The code, used to get the image is: 
 
TIFF *output; 
uint32 width, height; 
uint32 *raster; 
 
// Open the output image 
output = TIFFOpen ("output.tif", "w"); 
if (output == NULL) 
{ 
   fprintf (stderr, "Could not open output file\n"); 
   return 0; 
} 
 
width = 10; 
height = 10; 
 
if ((raster = (uint32 *) malloc(sizeof (uint32) * width * height * 3)) ==
NULL) 
{ 
   fprintf(stderr, "Could not allocate memory\n"); 
   return 0; 
} 
 
// set image content, here is the simpliest, cause doesn't matter 
for (unsigned int i=0; i<width*height; i++) 
{ 
   raster[i] = 0xffacacac; 
} 
 
// Write the tiff tags to the file 
TIFFSetField (output, TIFFTAG_IMAGEWIDTH, width); 
TIFFSetField (output, TIFFTAG_IMAGELENGTH, height); 
TIFFSetField (output, TIFFTAG_COMPRESSION, COMPRESSION_NONE); 
TIFFSetField (output, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG); 
TIFFSetField (output, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB); 
TIFFSetField (output, TIFFTAG_BITSPERSAMPLE, 8); 
TIFFSetField (output, TIFFTAG_SAMPLESPERPIXEL, 3); 
 
// uint32 rowperstrip = TIFFDefaultStripSize (output, 0); 
// for this simple case 
uint32 rowperstrip = 1; 
TIFFSetField (output, TIFFTAG_ROWSPERSTRIP, rowperstrip); 
    
tsize_t strip_size = TIFFStripSize (output); 
tstrip_t strips_num = TIFFNumberOfStrips (output); 
 
// Write the image 
for (unsigned int i=0; i<strips_num; i++)  
{ 
   if (TIFFWriteEncodedStrip (output, i, raster+i*strip_size, strip_size) ==
   0) 
   { 
      // error handling 
   } 
} 
 
free (raster); 
TIFFClose (output); 
 
return 1; 
    
 
I will appreciate any comments to this code and the cituation itself,
because I'm already disappointed to find the solution, reading articles
and debugging. 
 
Beforehand thanks,  
Alexey Aushev, Saint-Petersburg, Russia.