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I have a color specified in the CIE Lab* color space which is outside the range that standard sRGB monitors can display. I'd like to display an approximation of the given color (at the same luminance/L value as specified), but the maths is pretty gnarly and involves finding intersections between piecewise functions and so on.

Is there any reference code for this, or should I forge ahead with the maths?

To clarify: given a point a,b that is NOT within the shape below, I would like to find the nearest a,b that IS within the shape.

Lab color space

nornagon
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1 Answers1

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Here is an example using mat lab:

http://www.mathworks.com/matlabcentral/fileexchange/24009

Also there is a thread on the reverse function over here that mentions a site that has many programming examples for the conversion.

You could combine "CIE-L*ab —> XYZ" and the "XYZ —> RGB" conversion.

UPDATE:

I just found this: http://www.cs.washington.edu/research/imagedatabase/summerproject/2004/eye/src/yi/iu/processor/color/CIELab.java

But I couldn't find out what licence it uses, so maybe you should contact the author, if you are using it.

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devsnd
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  • Converting between the colors is fine; what I'm looking for is a way to find the closest point within [this shape](http://en.wikipedia.org/wiki/File:Lab_color_space.png) to some `a,b` which is outsidce that shape. – nornagon Apr 25 '12 at 21:44