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Saving to PNG changes gamma to 0.4545

Sep 8, 2011, 18:46
Post: #1
Saving to PNG changes gamma to 0.4545
Hello,

I've got similar problem to this thread:
http://marc.info/?l=gimp-user&m=125434270205824&w=3

I saved PNG without checked "Save gamma" but it saves the file with gamma set to 0.4545. I can see it while working with xloadimage:
Boot_800x600.png is 800x600 PNG image, color type RGB, 8 bit, file gamma 0.4545

It's too dark (other applications ignore this settings). I'm using GIMP 2.6.11. Newer version is not much possible (as it is unstable in my linux distribution). but if you're sure that newer version resolves this bug, I will gladly upgrade.

Can someone tell why this bug is still active even if it is known from older versions and how can I avoid it?
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Sep 8, 2011, 19:56
Post: #2
RE: Saving to PNG changes gamma to 0.4545
Ask Sven :-)

But I've ben using PNGs saved from Gimp with all default settings for years (which do not include saving the gamma), and never noticed anything.

However, if the SRGB default gamma is 2.2, not saving it or saving it to 2.2 is the same, and I'm not convinced that xloadimage isn't declaring the gamma as 2.2 because it doesn't see it but knows that proper decoding will use that value.

Now answering your questions on
https://Gimp-Forum.net
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