Gamma in PNG

[Solovei95]

It does not work PNG gamma correction

[xnview]

It does not work PNG gamma correction

You means that gamma in PNG are not used?

[Solovei95]

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

[DOS386]

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

[XnTriq]

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