https://bugzilla.wikimedia.org/show_bug.cgi?id=24854

--- Comment #15 from Robert Xiao <[email protected]> 2012-07-31 06:56:58 UTC 
---
>From my brief analysis over at Bug 38815, I've noticed that the images are
converted to 1-bit black when the thumbnail has width less than 85% of the
original, exacerbating this problem. So, it is probably more noticeable on
smaller thumbnails.

Furthermore, the effect is browser-dependent. Some browsers (and OSes) will
render the larger (>= 85% width) thumbnails fine, but others (in my testing,
Safari and OS X) actually invert the colours in the thumbnail (but not the
original) for some reason. The likely suspect is missing or incorrect ICC
profiles.

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