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November 2001

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2001.11.08 04:32 "using TIFFWriteScanline", by Bryce Loughnan

Hi 

I'm trying to make an 8 bit grayscale tiff using TIFFWriteScanline. I'm not
sure what I'm doing wrong.
I'm unsure about rowsperstrip. I have read through the docs, specs and
examples. But I don't seem to get it.

Hopefully this is trivial to someone out there.
Any help would be great!

thanx

bryce 


{
  uint32 w = 100;
  uint32 h = 100;
  uint16 spp = 1;
  uint16 photometric = PHOTOMETRIC_MINISBLACK;
  uint16 compression = COMPRESSION_NONE;

  TIFF* out = TIFFOpen("output.tif", "w");

  TIFFSetField(out, TIFFTAG_IMAGEWIDTH,  w);
  TIFFSetField(out, TIFFTAG_IMAGELENGTH, h);
  TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
  TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, spp);
  TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);
  TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
  TIFFSetField(out, TIFFTAG_PHOTOMETRIC, 1);
  TIFFSetField(out, TIFFTAG_COMPRESSION, compression);

  TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, 1);

  TIFFSetField(out, TIFFTAG_XRESOLUTION, 1);
  TIFFSetField(out, TIFFTAG_YRESOLUTION, 1);
  TIFFSetField(out, TIFFTAG_RESOLUTIONUNIT, 3);


   unsigned char values[100];
 
  int i;

  for(i=0; i < 100; i++)
   values[i]= 255;
  //values[i]= 100;

  for (i=0; i < 100; i++)
  {
   TIFFWriteScanline(out, values, h, 0);
  }

  TIFFClose(out);
 }





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