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Held: Wednesday, April 11, 2007
Summary: Today we consider some procedures for manipulating existing images.
(get-color-at image x y)gets a color from an image.
(set-color-at! image x y color)sets a color in an image.
(modify-image! transform image)applies
transformto every point in the image.
(rgb red green blue)
(green color), and
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