Open pastelsky opened 7 years ago
This is very useful! Thank you for filing it. I will study it in detail early next week.
The difference is because of color profile. Butteraugli ignores it and assumes sRGB.
Try comparing with some of the online website for appropriate comparison. For e.g. the following can be used
Not sure why this is happening, but butteraugli seems to ignore visible color differences in this case -
Original Image
90% Compression using guetzli
Notice how the green is clearly desaturated compared to the original. Butteraugli score - 1.540664
90% Compression using mozjpeg
The greens, as well as the picture as a whole are much more closer to the original image. Butteraugli score - 1.581931