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

(2000-09-12)