8000 Results · Issue #27 · google/butteraugli · GitHub
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Results #27

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pastelsky opened this issue Jun 25, 2017 · 3 comments
Open

Results #27

pastelsky opened this issue Jun 25, 2017 · 3 comments

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@pastelsky
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pastelsky commented Jun 25, 2017 •
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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
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This is very useful! Thank you for filing it. I will study it in detail early next week.

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

@shailenderjain
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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

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@pastelsky @jyrkialakuijala @shailenderjain
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