This is due to color management. I think I filed a bug report on the
Gnome bugtracker with slightly different information, but regarding
brightness jumping from 0 to ~5 out of 255:
According to http://www.lagom.nl/lcd-test/black.php, with 6-bit
dithering, usually "the darkest four shades (0, 1, 2,
While it isn't completely clear what the correct way to display images
is, if eog is in fact currently displaying them correctly it would help
to have an option to display them 'literally'. It doesn't seem like
there is any way to do this. Exact comparisons are helpful to diagnose
problems in other
** Attachment added: "geq.jpg"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366250/+files/geq.jpg
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Title
** Attachment added: "geq-128.png"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366253/+files/geq-128.png
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** Attachment added: "eog-firefox diff-threshold.png"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366257/+files/eog-firefox%20diff-threshold.png
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** Attachment added: "geq-200-convert.png"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366256/+files/geq-200-convert.png
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** Attachment added: "geq-200.png.jpg"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366254/+files/geq-200.png.jpg
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** Attachment added: "comparison.png"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366255/+files/comparison.png
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** Attachment added: "geq-200.jpg"
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** Attachment added: "geq-200.png"
https://bugs.launchpad.net/ubuntu/+source/eog/+bug/1436595/+attachment/4366251/+files/geq-200.png
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Some examples of how eog displays colours compared to imagemagick's display.
These files were generated as follows, using ffmpeg:
ffmpeg -filter_complex color=black:256x256,geq=X:240:128 -hide_banner -frames
1 geq.png
ffmpeg -filter_complex color=black:256x256,geq=X:240:128 -hide_banner -frame
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