<https://forum.reapermini.com/index.php?/topic/51585-reaperites-i-give-you-my-colour-comparator-spreadsheet/>
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"Hello Reaper Forum-goers! \n  \nI began painting minis with the first Bones Kickstarter.  You may have noticed that I've never actually posted a WIP or Shown Off anything...that's because I've been working on something else. \n  \nOftentimes I'd find a great tutorial on brushthralls, or YouTube, but invariably the author would use Citadel or VMC or P3 paint colours.  Even here on the Reaper forums, Buglips pulls out Coat d'Arms from time-to-time.  My colours consisted entirely of Reaper, and I needed a way to determine which colour I could use in the Reaper line to approximate the author's colours.  Well, I did some research, and found the  Vallejo colour compare spreadsheet PDF like everyone does.  The problem is that it's sparse.  It only contains exact matches, and not \"near matches\", and is incredibly difficult to read. \n  \nThen I found the CIE2000 colour difference formula: http://en.wikipedia.org/wiki/Color_difference#CIEDE2000 on wikipedia. \n  \nAfter slamming my face with the math for a bit, I broke out my crappy programming skills and started to do SOME SCIENCE! \n  \nI wrote a script to compare two colours.  Then I extracted the colours of each mini paint company that I could think of, and created RGB colour arrays for each brand.  I compared each brand's colours to each other brand's colours to find the best match by first converting to sRGB colour, then XYZ colour, then CIELAB colour and finally determining the colour difference.  Sometimes, there was no best match but at least I knew which colour was the closest by selecting the value with the lowest difference. \n  \nAnd finally, I compiled the whole thing into a spreadsheet for you to use. Please ignore the bit about the best match being bold, I haven't got around to that yet. \n  \nPlease make as much use of this as I have.  Also, if there's a savvy web programmer that could use my script to compare a custom list of colours (or two custom lists to each other) then let me know and I'll post the javascript. \n  \nEnjoy: https://docs.google.com/spreadsheet/ccc?key=0AuXf-f-0SRiHdDk5Q0VOOVUyaUJtR0dvTnNHY3UzdlE&amp;usp=sharing \n  \nAlso let me know if that link works, it's my first time sharing a Google Doc. \n"
<https://forum.reapermini.com/index.php?/topic/51585-reaperites-i-give-you-my-colour-comparator-spreadsheet/#comment-768885>