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If you ever need to make very accurate colour measurements, here is an affordable I2C module for it:

https://no.mouser.com/ProductDetail/Mikroe/MIKROE-3061?qs=gTYE2QTfZfRcXDZ%252BdfkWAA%3D%3D

Datasheet for module:

http://www.farnell.com/datasheets/2686339.pdf

Datasheet for chip:

https://ams.com/documents/20143/36005/AS73211_DS000556_3-01.pdf/a65474c0-b302-c2fd-e30a-c98df87616df

This sensor module can basically see colour the way the receptors on the human retina do. It can only see colour, not an image, but it's very accurate, and you could use this for monitor and light calibration, for example.