pnmpsnr: PSNR between tmp-page001.ppm and tmp-page001.ppm.pgm.ppm:
pnmpsnr: Y color component doesn't differ.
pnmpsnr: Cb color component  doesn't differ.
pnmpsnr: Cr color component doesn't differ.
pnmpsnr: PSNR between tmp-page002.ppm and tmp-page002.ppm.pgm.ppm:
pnmpsnr: Y color component doesn't differ.
pnmpsnr: Cb color component  doesn't differ.
pnmpsnr: Cr color component doesn't differ.
pnmpsnr: PSNR between tmp-page003.ppm and tmp-page003.ppm.pgm.ppm:
pnmpsnr: Y  color component: 81.71 dB
pnmpsnr: Cb color component: 35.86 dB
pnmpsnr: Cr color component: 26.43 dB