"Bob Larter" wrote in message
...
dennis@home wrote:


"The Natural Philosopher" wrote in message
...
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.

No it is not!

A transparency is a subtractive process.
An lcd is additive.

Um, this sounds a little confused. The important distinction is between
*additive* colour (eg; RGB) vs *subtractive* colour (eg; CMYK).
With RGB, you're *filtering* a full spectrum illuminant, with CMYK, you're
*absorbing* part of a full spectrum illuminant.

Its only confusing to people that don't understand that backlit LCDs, like
CRTs, add three primary colours together to make a colour image.
The source (phosphors or white light tubes/LEDs with colour filters) of the
primary colours may vary but the process is the same.

It is not the same as a slide which filters each pixel (that's picture
element to the one who claimed slides don't have pixels) through several
coloured layers or prints that do it with inks of various shades.