On 12/06/2021 17:57, Fredxx wrote:
On 12/06/2021 14:12, #Paul wrote:
Fredxx wrote:
I'm sure the eye response is very different to film emulsion response.

Also, which may be relevant here - eye responses differ, sometimes
by quite a lot - between people.

They do indeed.

But the relevant blue, red, green cones in eyes have a similar response
in terms of wavelength.

Where the difference you mention comes from having different proportions
of these cones, or even one type missing.

Actually people have measured the responses of the cones and have found
that they are not RGB; one lot are blue sensitive and the other two are
in the yellow; yellow and greeny yellow. Rather close, but the brain can
make sense of them and detect subtle differences in colour. Non-primate
mammals such as dogs and cows just have the blue and the yellow.

It appears that, in (most) primates, the gene for the yellow cones
duplicated and one copy mutated to change its frequency sensitivity.

The RGB idea came from Maxwell who was a Famous Scientist who made the
first colour photograph (of a tartan scarf) by taking three pictures
through red, green and blue filters. But, in those days, photographic
emulsions weren't sensitive to red at all, so the "red" filter must have
been passing some other colour, perhaps UV.

But he was a Famous Scientist.

--
Max Demian