2.1.2 [PNG:2003] Section 4.6, Additional information
V0002:
-
Gamma and chromaticity: Gamma characteristic of the image with respect to the desired output intensity, and chromaticity characteristics of the RGB values used in the image.
All Document Modes (All Versions)
When the gAMA chunk is present, the gamma conversion to a display gamma of 2.2 is incorrectly applied; a display gamma of ~1.9 is used instead of a 2.2 display gamma.
V0003:
-
sRGB colour space A rendering intent (as defined by the International Color Consortium) and an indication that the image samples conform to this colour space.
All Document Modes (All Versions)
The sRGB chunk is not supported.