What exactly happens when you Posterize a grayscale image?

CG
Posted By
Charles_Greenberg
Jun 18, 2004
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436
Replies
1
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Closed
When you use the posterize command, are all the intensities rounded to the closest of the new values? What happens exactly? Thanks!

Charles
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George_Austin
Jun 18, 2004
Charles,

Divide 255 by N-1 (N is the number of posterization levels). Multiply the result including the fractional remainder by 0,1,2,3… and each time discard the fractional remainder. With 8 levels, for example, you then get 0/ 36/ 72/ 109/ 145/ 182/ 218/ 255 for the tonal levels produced.

George

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