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butteraugli estimates the psychovisual difference between two images
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Results #27

Open pastelsky opened 7 years ago

pastelsky commented 7 years ago

Not sure why this is happening, but butteraugli seems to ignore visible color differences in this case -

Original Image

mat-original

90% Compression using guetzli

mat-guetzli-90

Notice how the green is clearly desaturated compared to the original. Butteraugli score - 1.540664

90% Compression using mozjpeg

mat-mozjpeg-90

The greens, as well as the picture as a whole are much more closer to the original image. Butteraugli score - 1.581931

jyrkialakuijala commented 7 years ago

This is very useful! Thank you for filing it. I will study it in detail early next week.

jyrkialakuijala commented 7 years ago

The difference is because of color profile. Butteraugli ignores it and assumes sRGB.

shailenderjain commented 2 years ago

Try comparing with some of the online website for appropriate comparison. For e.g. the following can be used

https://miniimagesvideos.com https://compressjpeg.in