pnmpsnr

Compute the difference between two images. More information: https://netpbm.sourceforge.net/doc/pnmpsnr.html.

pnmpsnr path/to/file1.pnm path/to/file2.pnm

pnmpsnr path/to/file1.pnm path/to/file2.pnm -rgb

pnmpsnr path/to/file1.pnm path/to/file2.pnm -target n

pnmpsnr path/to/file1.pnm path/to/file2.pnm -target1 threshold_Y -target2 threshold_Cb -target3 threshold_Cr

pnmpsnr path/to/file1.pnm path/to/file2.pnm -rgb -target1 threshold_red -target2 threshold_green -target3 threshold_blue

pnmpsnr path/to/file1.pnm path/to/file2.pnm -machine