Post Reply 

Saving to PNG changes gamma to 0.4545

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

I've got similar problem to this thread:

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?
Find all posts by this user
Quote this message in a reply
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
Visit this user's website Find all posts by this user
Quote this message in a reply
Post Reply 

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  change the default export setting of Untitled.png ezz9 2 220 Jun 9, 2017 16:31
Last Post: ezz9
  Exporting Multiple Layers Into Images (PNG, JPG, etc) SavingMultipleImages 22 10,757 Oct 6, 2014 10:59
Last Post: rich2005
  Gimp Crashes when: Opening A File, Creating A New File, Saving The File and exporting tomayopan 2 422 Sep 1, 2014 21:34
Last Post: tomayopan
  OSX: cannot export to PNG CoolguyLuke 4 921 Jun 9, 2014 08:25
Last Post: ofnuts
  Suggestion: PNG and JPG buttons rublacava 2 324 Jun 8, 2014 11:25
Last Post: iForStyle007

Forum Jump:

GIMP ForumPortalArchiveContactTermsRSS