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→{{header|Common Lisp}}
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=={{header|Common Lisp}}==
Use the function rgb-to-gray-image to convert a rgb-image as loaded by the function defined [[Bitmap read#Common Lisp]]. The package identifier assumes that you have the packeage as defined in [[Basic bitmap storage#Common Lisp]].
<lang lisp>
(in-package #:rgb-pixel-buffer)
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