MATLAB: How to convert a rgb image to CLElab color space

digital image processingimage processing

I need to convert a rgb image to CLElab color space to extract some features.I came across rgb2lab() function which converts rgb image to CIE 1976 L*a*b*.

Is the CIE 1976 L*a*b* same as CLElab color space??I mean is that what i need?

If not, please help me how to convert RGB to CLElab colorspace.

Thank you.

Best Answer

I've never heard of CLElab and a quick search doesn't find anything related to colour spaces, so I think you can safely assume that you're looking for CIE Lab, which is commonly just called Lab (or L*a*b*).

So, yes, rgb2lab is the correct function.

Normally you convert to a colour space because it has the properties you need so you should know whether L*a*b* is the actual colour space you want.

Note that RGB is device dependent while L*a*b* isn't, so conversion may not be just as simple as just calling rgb2lab.

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I'd just use colormap and not mess with contours unless you know what you're doing and what you want. To pseudocolor a grayscale image an leave it as grayscale but display it as colored:

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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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