On Wed, 2009-09-30 at 20:53 +0300, Juhana Sadeharju wrote:
> What an earth. I found that GIMP has placed file gamma 0.4545
> to PNG images without my will.
> $ xloadimage x.png
> x.png is 1120x840 PNG image, color type RGB, 8 bit, file gamma 0.4545

As far as I know PNG expects the gamma to be set to the gamma correction
of the PNG file based on the screen gamma i.e. the display exponent.
That would be 1/gamma then. GIMP sets the gamma value 2.2, which is the
gamma value for the sRGB color space.

> How to configure GIMP to not set the file gamma?

Do not check the checkbox labeled "Save gamma" in the PNG save dialog.


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