How to convert RGB to CIE Lab color space?
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Sabarinathan Vadivelu
le 7 Sep 2012
Commenté : Image Analyst
le 10 Juil 2019
How to convert RGB to CIE Lab color space?
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Image Analyst
le 7 Sep 2012
Convert the image to L*a*b* color space using makecform and applycform.
colorTransform = makecform('srgb2lab');
lab = applycform(rgbImage, colorTransform);
Here's a full demo here: http://www.mathworks.com/products/demos/image/color_seg_k/ipexhistology.html
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Image Analyst
le 4 Jan 2017
zee, you can also use rgb2lab(). But, what output are you expecting? You get an image. And to see that image you can use imshow(), or you can just look at its values in the variable editor in the workspace. But no output will get "shown" unless you do one of those two things. Otherwise all you get is a new variable.
If you want to see the 3-D color gamut, you can use colorcloud() (R2016b and later).
Plus de réponses (3)
Deepak Panda
le 13 Oct 2015
How can I transfer rgb to Lab color space with luminance [0 100], a [-86.18 98.23] and b [-107.86 94.47]
5 commentaires
Kondal Rao J
le 16 Juin 2017
If you have higher version than 2014....just rgb2lab is sufficient to convert the image to lab color space
Yoon ThiriZaw
le 14 Juin 2019
Can we calculate rgb to lab without matlab code using hand calculation?
3 commentaires
Image Analyst
le 14 Juin 2019
Try here: easyrgb.com
![0001 Screenshot.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/224511/0001%20Screenshot.png)
First go from RGB to XYZ, then XYZ to LAB.
Or you could try Bruce Lindbloom's site
![0000 Screenshot.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/224512/0000%20Screenshot.png)
The above are just images so you can't click on them. But click on the link and go to the site and click on the formula you want and it will be there.
Just be aware that your LAB values will NOT be the same as what you get from a spectrophotometer, unless you do a calibration.
kasthuri c
le 10 Juil 2019
how to find the values of L paramete a parameter b parameter in Lab conversion method.
1 commentaire
Image Analyst
le 10 Juil 2019
labImage = rgb2lab(rgbImage);
LImage = labImage(:, :, 1);
aImage = labImage(:, :, 2);
bImage = labImage(:, :, 3);
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