File: png-ignore-zero-gamma-20010413.txt It is proposed to add to the PNG specification version 1.2, section 10.5 (Decoder gamma handling), and to the PNG ISO Draft, Clause 13.13, (Gamma handling), immediately preceding the paragraph that begins "It is not necessary to perform transcendental math ...", the following paragraph: A gAMA chunk containing zero is meaningless, but could appear by mistake. Decoders should ignore it, and editors may discard it and issue a warning to the user.