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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)


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