XnView Software

Posted: **Thu Nov 17, 2011 11:34 am**

It does not work PNG gamma correction

Posted: **Fri Nov 18, 2011 8:30 am**

Solovei95 wrote:It does not work PNG gamma correction

You means that gamma in PNG are not used?

Posted: **Wed Nov 23, 2011 11:32 am**

XnView does not work native gamma correction in PNG.
The simplest formula is:
pow (channel/255, 1 / (gamma * 2.2));

gamma - gamma from PNG gAMA chunk
channel - RGB channel

Posted: **Wed Nov 23, 2011 2:46 pm**

Solovei95 wrote:XnView does not work native gamma correction in PNG.

The preferred colorspace is sRGB anyway, not pow(unpredictable random value).

http://libpng.org/pub/png/book/chapter1 ... ch10.div.6

http://libpng.org/pub/png/spec/1.2/PNG- ... tml#C.sRGB

http://en.wikipedia.org/wiki/SRGB

Posted: **Wed Nov 23, 2011 11:45 pm**

Willem van Schaik: PngSuite » Gamma values
Henri Sivonen: The Sad Story of PNG Gamma “Correction”
Trevor Morris: The PNG Gamma Dilemma

XnView Software

Gamma in PNG

Gamma in PNG

Re: Gamma in PNG

Re: Gamma in PNG

Re: Gamma in PNG

Re: Gamma in PNG