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Queried for: Adam7  About Adam7

Definition:

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