How much of what an unfiltered sensor records is invisible
Drawn at its defaults, in cameras, sensors and reproduction. It takes no options at all, so every essay calling it gets this exact drawing.
Called by 3 essays
the blast radius of changing it
The filter that makes colour possible
An infrared-cut filter is not a refinement on a colour camera. Removing it collapses the separation between the three channels by a factor of nearly nine under tungsten, and the component that keeps colour photography working is the one nobody photographs.
What a camera doesMost things are pale in the infrared
A spectrophotometer stops at 780 nanometres and a black cotton shirt reflecting five per cent of visible light reflects more than half the near infrared. The measurement everybody has and the quantity a camera integrates are different quantities, and nothing in the first says so.
What a camera doesThe grid outside every figure
Every figure here is computed on 380 to 780 nanometres, which is exactly right for an eye and insufficient for a sensor. This field met the first subject the grid cannot hold, and the decision was not to widen it — because widening it honestly is impossible.