2.1.2 [PNG:2003] Section 4.6, Additional information

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V0002:

The specification states:

 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:

The specification states:

 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.