Posted: Aug 19, 2017 10:23 pm
by romansh
GrahamH wrote:
From the 'blue-grey' pixels of course. You can't make grey without red photons.

BTW the light sources may not be perfectly monochromatic. For most TFT displays it will be white LEDs or electroluminescent lighting which are far from monochromatic shining though bandpass filters for RG & B that are tens of nm wide.

OK what I am trying to ask is when David said:
DavidMcC wrote:
GrahamH wrote:Yes, the strawberries look red ( a rather bluish-red). The very reason that picture has been so widely circulated is because people see red. Ditto for the black/blue/white/gold dress where people are convinced it is one or the other colour combination.
I think it is more because the background is so in-red more than an internal model of what colour strawberries should be.

They still look grey-blue to me, I'm afraid, not in the least red.

where did the grey come from on the strawberry picture for David?