system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If remote controls use infrared light, why does it appear blueish when recorded on a cellphone?
gpt
Near-Infrared light, such as what is used by infrared LED remote controls, appears purple/indigo/blueish when recorded by a lot of cameras because the engineers who programmed the image processing algorithms for those cameras chose to map infrared to an indigo colour in order to preserve the colour balance of photographs taken outside in full sunlight.

If the infrared light we can't see were mapped to a red colour in the photograph, then photographs taken in full sunlight would be disproportionately reddish. 

By mapping it to blue (which has a lower intensity in sunlight due to being naturally scattered by the atmosphere), the engineers found a simple way to "dispose" of the signal.