RGB to Lab color space

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Ivana
Ivana 2016-12-6
评论： Ivana 2016-12-7
I want to converte RGB values to Lab, I read that conversion goes between XYZ color space. Ofcourse, I find directly alghorithm in Matlab
labTransformation = makecform('srgb2lab');
labI = applycform(image,labTransformation);
l = labI(:,:,1);
a = labI(:,:,2);
b = labI(:,:,3);
but it shows me values between 0-255 and I need standard values for Lab, L=0-100, a,b=-127+128. Because later I want calculate C and H with a, b values.
Thanks.

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Adam
Adam 2016-12-6
Just using
lab = rgb2lab(rgb);
seems to give results in the expected output range. I'm not sure what all the extra work of creating a colour transform gives you, even if it did give the answer you want.
  1 个评论
Ivana
Ivana 2016-12-7
Thanks, I also found this conversion when I get Lab in uint 8 (0-255) to convert to Lab standard range values: L=L/2,55; a=a-127; b=b-128. I chek this and it realy works, now I will update my algorithm.

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