# PngSuite - Ancillary chunks / PNG-files

| ccwn2c08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06 ccwn3p08 - chroma chunk w:0.3127,0.3290 r:0.64,0.33 g:0.30,0.60 b:0.15,0.06 cdfn2c08 - physical pixel dimensions, 8x32 flat pixels cdhn2c08 - physical pixel dimensions, 32x8 high pixels cdsn2c08 - physical pixel dimensions, 8x8 square pixels cdun2c08 - physical pixel dimensions, 1000 pixels per 1 meter ch1n3p04 - histogram 15 colors ch2n3p08 - histogram 256 colors cm0n0g04 - modification time, 01-jan-2000 12:34:56 cm7n0g04 - modification time, 01-jan-1970 00:00:00 cm9n0g04 - modification time, 31-dec-1999 23:59:59 cs3n2c16 - color, 13 significant bits cs3n3p08 - paletted, 3 significant bits cs5n2c08 - color, 5 significant bits cs5n3p08 - paletted, 5 significant bits cs8n2c08 - color, 8 significant bits (reference) cs8n3p08 - paletted, 8 significant bits (reference) ct0n0g04 - no textual data ct1n0g04 - with textual data ctzn0g04 - with compressed textual data

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Willem van Schaik, Singapore, March 1998 http://www.schaik.com/wwwillem.html