Hi, this function used to convert RGB to Lab is correct? http://www.mathworks.com/matlabcentral/fileexchange/24009-rgb2lab/content/RGB2Lab.m because for example for R=1 G=50 B=32
L = 45.6503487273573 a = -34.2039653178358 b = 4.70335871603924
but this site http://www.colorhexa.com/013220 returns
L = 17.422 a = -21.096 b = 7.117
What's the correct result please?
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Well, neither, and both. It's possible that each uses different white points. If you want to use color formulas, I'd recommend using those from Stephen Westland http://www.mathworks.com/matlabcentral/fileexchange/36315-computational-colour-toolbox. This professor of color science at the University of Leeds is one of the top color scientists in the world (I met him last week at the Color Imaging Conference in Los Angeles where he was the conference chairman). Why do I say "neither"? Well because those are just "book formulas" and have little to no relation with what LAB value you will measure from your object if you measure it with a colorimeter or spectrophotometer. If you take a picture of something and then want the "real" lab like you'd get from a spectrophotometer, then you'll have to calibrate your system and not just use book formulas.