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Revision as of 16:01, 20 June 2005 by Zundark (talk | contribs) (It's not a compression algorithm!)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)Adam7 is the interlacing algorithm specified for use in PNG images. An interlaced PNG image is broken into seven subimages, which are defined by replicating the following 8x8 pattern across the full image:
1 6 4 6 2 6 4 6 7 7 7 7 7 7 7 7 5 6 5 6 5 6 5 6 7 7 7 7 7 7 7 7 3 6 4 6 3 6 4 6 7 7 7 7 7 7 7 7 5 6 5 6 5 6 5 6 7 7 7 7 7 7 7 7
The subimages are stored in the PNG file in numerical order.
Adam7 is named after Adam M. Costello, who suggested the method on 30 January 1995, based on a very similar five-pass scheme that had earlier been proposed by Lee Daniel Crocker.
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