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

That's not really right...

The color rendition of a transparency -- or print -- is intended to be
"correct" under a specific illuminant, usually one with a continous
spectrum, at a specific color temperature.

For the colors in a print or transparency to be "correct" in any absolute
sense -- that is, to actually "match" the colors of the original scene --
they would have to have the same spectral characteristics. They rarely do.
And they don't have to, if the way the eye is stimulated is close.


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

Exactly the same thing applies to prints and transparencies. What the eye &
brain think they see is all that matters.


OK?

Nope. See preceding.