Andy Champ wrote:
The Natural Philosopher wrote:
Andy Champ wrote:
The Natural Philosopher wrote:

Color transparencies which are used in pro film applications say
your are a liar.

Not really. Transparencies subtract some colours from the
transmitted light; prints subtract some from the reflected light.
Displays make their own...


Ah, so that is why they are backlit then?

So they can 'make their own?
What a prat. An LCD display IS a color transparency.

Dear me. Got out of bed the wrong side today? You do seem to be
getting a little impolite lately! Anyway...

Unlike a slide (usually shown with a halogen lamp) or a print (usually
shown under whatever ambient light is about) most LCD displays have a
backlight specially chosen by the manufacturer to meet some compromise
of (good colour, cheap, low power, probably something else I can't think
of) when operating with the particular LCD filters in front of them.

A slide has a pretty good match to the colours of the real scene. It
has to, because the slide manufacturer didn't make the projector.

There's no such requirement for a display - it's the light emitted by
the entire combination of backlight and filters that matters.

OK?

Andy

No transparency can show a spectral section that isn't in the spectrum
of the illuminant.

Which is why monochromatic backlights or projector light sources are not
used.

I challenge you to e.g. produce a natural colour with a sodium lamp..no
matter how you tweak the color dyes.