Adam7

<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

Last updated: 2000-09-12

Nearby terms:

AdalineAda LovelaceADAMAdam7AdamakegenADAMOAdam Osborne

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