[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a color sensor. Those Cadmium Sulfide lights sensors usually have a very wide swing of resistance when exposed to varying lev… ...

You can throw a Raspberry Pi camera and OpenCV at the problem and approach it through software, or you can buy an off-the-shelf RGB sensor and wire it up to an Arduino.

Get a color-matching sensor for just $60 It's like the design equivalent of Shazam.

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Now through November 9, you can get Nix Mini 2 Color-Matching Sensor for 39% off $99 at just $59.97.

Never guess (or second guess) a color again. Through April 21, you can score the Nix Mini 2 color-matching sensor on sale for only $59.97, no coupon needed. StackSocial prices subject to change.

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TL;DR: The Nix Mini Color Sensor captures any color you see in the world and matches it to paint or digital formats, now on sale for $49.97.