please give the explanation of LAB and its conversion .
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The Image Processing Toolbox has conversion functions implemented:
should get you started. Otherwise take a look e.g. at http://www.brucelindbloom.com where colorspaces and their conversion math is described in detail.
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i search one more link http://www.easyrgb.com/index.php?X=CALC#Result .
Is results same like www.brucelindbloom.com?
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