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Computing (FOLDOC) dictionary
Adam7
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graphics, algorithm One of the progressive coding methods
used in PNG images. Adam7, named after its author, Adam
M. Costello, consists of seven distinct passes over the image.
Each pass transmits a subset of the pixels in the image.
The pass in which each pixel is transmitted is defined by
replicating the following 8-by-8 pattern over the entire
image, starting at the top left:
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