tiff_ex1.c

/**cc -oreadtiff -L/usr/lib/ -ltiff  readtiff.c **/
/**cc -oreadtiff  -ltiff  readtiff.c **/

#include <tiffio.h>
#include <stdlib.h>
uint32 w,h,*raster;
size_t npixels;

int main(int argc, char* argv[])
{
  TIFF* tif = TIFFOpen(argv[1], "r");
  if(tif){
    read_image_size(tif);
    read_directory(tif);

    raster = (uint32*)_TIFFmalloc(npixels * sizeof(uint32));
    if (raster != NULL) {
      if (TIFFReadRGBAImage(tif, w, h, raster, 0)) {
      test_raster();
	  }
      _TIFFfree(raster);
    }
    TIFFClose(tif);
  }
  exit(0);
}

read_image_size(TIFF* tif){
  TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &w);
  TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &h);
  npixels = w * h;
  printf("%5d %5d %5u\n",w,h,npixels);
}

read_directory(TIFF* tif){
  int dircount = 0;
  do{
    dircount++;
  } while (TIFFReadDirectory(tif));
  printf("%d directories\n",dircount);
}

test_raster(){
  int i;
  for(i=0; i < npixels; i++)
    printf("%5d %5d : %10d %10d %10d %10d\n", i % w, i / w,
      TIFFGetR(raster[i]), TIFFGetG(raster[i]), 
      TIFFGetB(raster[i]), TIFFGetA(raster[i]));
}