how to convert RGB to LAB , using D65 illuminant ?

please give the explanation of LAB and its conversion .

Answer 1

[Titus Edelhofer]

The Image Processing Toolbox has conversion functions implemented:

doc makecform

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.

Titus

[preet]

i search one more link http://www.easyrgb.com/index.php?X=CALC#Result . Is results same like www.brucelindbloom.com?