Consider other image comparison algorithm

[abarre]

I see that there is a script called "butteraugli" that compare two images and give a score : https://github.com/google/butteraugli

I think that could be an interesting addition for jpeg-recompress.

[danielgtaylor]

This is very interesting! Anybody want to try adding it? Note that it requires getting gamma information from input images and preprocessing pixels before running the diff algorithm.

[zvezdochiot]

Hi all.

Butteraugli is too long. Use the guetzli encoder (it has this metric).