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There's a mismatch between the sensitivity of colour pixels in a digital camera sensor and the sensitivity of colour sensing cells in the human eye. We don't normally notice until we try to take a picture of the whole visible spectrum (like in a rainbow!). For example if you take a picture of a rainbow with a goPro Hero 7 violet disappears!
I also talk about how computer screens can show violet even though the pixels only go as far as blue.
Here's my video about how cones cells work:
https://youtu.be/dvovtbLGaUw
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