MATLAB: Rgb2lab color conversion

Image Processing Toolboxrgb2lab

Hi, I am using rgb2lab color space conversion and am receiving values in the range of e+03, are these values correct?

Best Answer

Either convert the input argument to uint8 or divide it by 255 and you will get the correct output. Many MATLAB color/image functions assume that a double input is in the range 0-1, which clearly your data is not.

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MATLAB: Increase RGB image saturation.

This is easier in HSV colorspace:

RGB = rand(100, 100, 3);
HSV = rgb2hsv(RGB);
% "20% more" saturation:
HSV(:, :, 2) = HSV(:, :, 2) * 1.2;
% or add:
% HSV(:, :, 2) = HSV(:, :, 2) + 0.2;
HSV(HSV > 1) = 1;  % Limit values
RGB = hsv2rgb(HSV);

MATLAB: RGB to Lab color space

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.

Best Answer

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MATLAB: Increase RGB image saturation.

MATLAB: RGB to Lab color space

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