2.1.5 [W3C-PNG] Section, gAMA Image gamma


The specification states:

 For gAMA these are the reference viewing conditions of the sRGB specification 
 [IEC-RGB], which are based on ISO 3664 [ISO-3664].

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.