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POHow would I compare a single RGB value with a collection to find the closest match using the CIE94 formula - in Ruby,
 

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  1. POHow would I compare a single RGB value with a collection to find the closest match using the CIE94 formula - in Ruby,
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    <p>I have an RGB value, and I would like to find the closest match to that RGB value from a collection of 120 colours.</p> <p>From what I gather, one of the most accurate ways of implementing such a check is to use the <a href="http://en.wikipedia.org/wiki/Color_difference#CIE94" rel="nofollow">CIE94 formula</a>. However, I am having trouble implementing this using Ruby. </p> <p>How would you suggest I do this?</p> <pre><code> R1, G1, B1 = pixel.red, pixel.green, pixel.blue c = Colour.first R2, G2, B2 = (c.red * 256), (c.green * 256), (c.blue * 256) C1 = Math.sqrt((G1**)+(G2**)) C2 = Math.sqrt((B1**)+(B2**)) CAB = C1 - C2 DA = G1 - G2 DB = B1 - B2 DH = Math.sqrt((DA** + DB** - CAB**)) divergence = Math.sqrt( ((R1-R2)/2)** + (CAB/ (1+(0.048*C1)))** + ( DH / ( 1 + ( 0.014 * C1))** ) </code></pre> <p>Following one of the answers suggestion to use LCMS, I just realized that RMagick (Imagemagick) the ruby library I am using, actually pulls in LCMS. This implies that I may have access to some of this functionality - 'pre-baked'. Is anyone aware of a way to achieve the above using RMagick?</p>
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    1. USRMcNairn
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    1. COAs a first step you need to show the code you've written. It's easier for us to correct your code than to write it from scratch.
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      1. USthe Tin Man
    2. CONo prob, ive updated by post to show my code.
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