How to find Hue and chroma values of images

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SNEHAMOL K
SNEHAMOL K 2020-12-5
编辑： DGM 2021-11-4
I have a image data set.I converted them in to L*A*B color space,How can I find hue and chroma values of this image dataset.

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Swetha Polemoni
Swetha Polemoni 2020-12-8
Hi SNEHAMOL K
You can try first converting the image color from L*a*b* color space to RGB color space using "lab2rgb" and then you can convert it from RGB color space to hue, saturation(chroma), and value (HSV) color space using "rgb2hsv".
Hope this helps.

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DGM
DGM 2021-11-4
编辑：DGM 2021-11-4
If you're working in LAB and you want Hue and Chroma (i.e. the polar representations of the model you're already in) then I don't see the point in converting to HSV and calculating something unrelated.
If you want LCHab, simply convert your LAB representation into cylindrical coordinates, or simply use the cform tools in IPT.
rgbpict = imread('peppers.png');
labpict = rgb2lab(rgbpict); % you already have this
c = makecform('lab2lch');
lchpict = applycform(labpict,c);
There are other tools available on the File Exchange if you want to go straight from sRGB to LCHab and vice-versa.
https://www.mathworks.com/matlabcentral/fileexchange/28790-colorspace-transformations
https://www.mathworks.com/matlabcentral/fileexchange/53354-colorspace-conversion-tools

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