Colour Science & Perception
what the eye settles, and what it cannot
Generator

One reflectance, four different infrared tails, and what the camera makes of each

The same visible reflectance continued past 780 nm to four different near-infrared values. A spectrophotometer reports only the left-hand part; an unfiltered sensor integrates all of it. The channel spread falls from 0.14 at a tail of 0.05 to 0.02 at 0.85, with nothing about the visible half changed.
One reflectance, four different infrared tails, and what the camera makes of eachThe same visible reflectance continued past 780 nm to four different near-infrared values. A spectrophotometer reports only the left-hand part; an unfiltered sensor integrates all of it. The channel spread falls from 0.14 at a tail of 0.05 to 0.02 at 0.85, with nothing about the visible half changed.0.250.500.751.00780 nm4006008001000wavelength / nmtail 0.05tail 0.35tail 0.62tail 0.85RGBspread 0.06RGBspread 0.02RGBspread 0.01RGBspread 0.01unfiltered sensor at 3600 Kraw response, no matrix applied

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the blast radius of changing it

What a camera does

Most 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.

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