Shading: Shading is a real easy effect to do to an image. You
take the same basic code as used in the previous example and you alter the
part in the for-loop to simply change the value of every Nth pixel (in the
case every fifth pixel). You don't have to test for color values in the
original picture since you are just changing pixels automatically. Your
assignment, however, can be found by clicking the link at the bottom of the
page.
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