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October 2007
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2007.10.31 00:01 "Re: Rookie question", by Leonardo Serni
>I am new to libTiff. I am looking for a way to create TIF image files
>(or any other graphics format) from "raw" simulation data. (basically it
>is 3-d data projected on a 2-D plane. What it comes down to is that I
>have a bunch of "pixels", a discrete coordinate (that translates to a
>pixel in an image) and RGB values. (I basically just want to create an
>image by doing something like "this pixel has these RGB values" and
>"stick them in an image file.
>
>It probably can be done with libTiff, right ? are there any examples
>that I can take a look at ?
You can do this quite easily (no error checking included, see man pages):
#include <stdint.h>
#include "tiffio.h"
int main(int argc, char **argv)
{
TIFF *tif;
char buffer[3*1024];
uint32_t width = 1024, height = 768, row;
if (2 != argc)
{
fprintf(stderr, "syntax: %s outfile.tif\n", argv[0]);
return -1;
}
tif = TIFFOpen(argv[1], "w");
TIFFSetField (tif, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField (tif, TIFFTAG_IMAGELENGTH, height);
TIFFSetField (tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField (tif, TIFFTAG_SAMPLESPERPIXEL, 3);
TIFFSetField (tif, TIFFTAG_BITSPERSAMPLE, 8);
TIFFSetField (tif, TIFFTAG_EXTRASAMPLES, 0, NULL);
TIFFSetField (tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
TIFFSetField (tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
TIFFSetField (tif, TIFFTAG_IMAGEDESCRIPTION, "3D Simulation");
/* Other compressions exist, of course */
TIFFSetField (tif, TIFFTAG_COMPRESSION, COMPRESSION_DEFLATE);
TIFFSetField (tif, TIFFTAG_PREDICTOR, 1 /* experiment */);
/* Suggest rps = 20000/width so that a strip is around 64K
and possibly try to keep rps to a power of 2
(unless width is itself a power of 2, of course)
*/
TIFFSetField (tif, TIFFTAG_ROWSPERSTRIP, 16);
for (row = 0; row < 768; row++)
{
int i;
for (i = 0; i < 1024; i++)
{
buffer[3*i] = row % 255;
buffer[3*i+1] = i % 255;
buffer[3*i+2] = (row >> 2) % 255;
}
TIFFWriteScanline(tif, buffer, row, 0);
}
TIFFClose(tif); tif = NULL;
return 0;
}
Leonardo