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#!/bin/sh

...
   pgmtoppm '#fff' $img.pgm > $img.pgm.ppm   # convert back to RGB
   pnmpsnr $img $img.pgm.ppm                 # diff
done

%!PS
/Helvetica findfont 50 scalefont setfont
...
1 0 0 setrgbcolor          % red
100 400 moveto text show
showpage

pnmpsnr: PSNR between tmp-page001.ppm and tmp-page001.ppm.pgm.ppm:
pnmpsnr: Y color component doesn't differ.
...
pnmpsnr: Y  color component: 81.71 dB
pnmpsnr: Cb color component: 35.86 dB
pnmpsnr: Cr color component: 26.43 dB