<https://forum.reapermini.com/index.php?/topic/51585-reaperites-i-give-you-my-colour-comparator-spreadsheet/#comment-769828>
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"I'm not sure how Silicon-Knights ever did their colour compare.  As such, I'm not really sure how you could possibly recreate that project.  My only thought would be to use a colorimeter, which returns the wavelength of light reflected from a given surface.  Then you need to translate the wavelength into some colour based on the CIELAB gamut...it's beyond my knowledge at that point, but you'd need to generate an \"infinitely thick\" layer of paint so that the reflected light was just from the paint and not from the backing.  Each colour swatch would need to be based on something very black and very matte.  I just threw this together as a quicky project but realized that colours are really, really complicated.  There's a ton of literature on this stuff. \n  \nEdit: You could also use a professional, calibrated scanner.  Again, you'd need to have an 'infinitely thick' layer of paint, but you could then just scan in the chip and use the average RGB over the whole chip from the scanned image.  You could have friends mail you their chips in either case but you'd need to ensure you all used the same process (ie, identical backing material, same # of layers, no thinning, same dry time between layers, etc). \n  \nSpot-checking would be super, even if it's only P3&lt;-&gt;Reaper.  There's quite a few colours that are listed as \"perfect matches\" in that range, so try those first...you can probably safely exclude Black and White. \n  \nSanguine Base -&gt; Bloodstain Red \nSkorne Red -&gt; Carnage Red \nCygnus Yellow -&gt; Lemon Yellow \nUmbral Umber -&gt; Dark Shadow \nBootstrap Leather -&gt; Chestnut Gold \nGnarls Green -&gt; Pine Green \nCygnar Base -&gt; Coalition Blue \nCygnar Highlight -&gt; Ultramarine Highlight \nFrostbite -&gt; Ghost White \nBattledress Green -&gt; Okavango Swamp \n  \nAny or all of those that you can spot check would be super, thanks Wren!  Even if my \"perfect\" matches are instead \"damn close\" I would probably consider this project a success. \n"
<https://forum.reapermini.com/index.php?/topic/51585-reaperites-i-give-you-my-colour-comparator-spreadsheet/#comment-768885>