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Bitmap/Read a PPM file: Difference between revisions
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return img;
}
}</c>
The following acts as a filter to convert a PPM file read from standard input into a PPM gray image, and it outputs the converted image to standard output (see [[Grayscale image]], [[Write ppm file]], and [[Raster graphics operations]] in general):
<c>#include <stdio.h>
/* #include "imglib.h" */
int main()
{
image source;
grayimage idest;
source = get_ppm(stdin);
idest = tograyscale(source);
free_img(source);
source = tocolor(idest);
output_ppm(stdout, source);
free_img(source); free_img((image)idest);
return 0;
}</c>
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