Why you can't take a good picture of a rainbow

Sponsored by Dashlane. Get Dashlane on free on your fist device at https://dashlane.com/steve. And 10% off premium with promo code: steve 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:    • Vision Is Actually A Chemical Reaction   You can buy my books here: https://stevemould.com/books You can support me on Patreon here:   / stevemould   just like these amazing people: Glenn Watson Peter Turner Joël van der Loo Matthew Cocke Mark Brouwer Deneb Twitter:   / moulds   Instagram:   / stevemouldscience   Facebook:   / stevemouldscience   Buy nerdy maths things: http://mathsgear.co.uk