> I don't believe either technologies can be "fixed" for quality work.
> Tungsten and Halogen/Tungsten have continuous spectrum so can be
> corrected either by filter on lamp, filter on lens or afterwords in
> software.

> The problem isn't colour temperature but lack of emission at all.

A good measure of ONE aspect of rendition is CRI aka color rendering
index. A source with CRI=3D100 notionally renders objects colour
perfect.  YMMV.

I broadly agree with Michael's assessments, but suggest that you can
do quite well on many occasions with compromise solutions. These can
however let you down very unexpectedly when some mix of conditions
highlights a weakness that is not normally too obvious.

Adding extra in fill LEDs at other temperatures is liable to be able
to improve CRI.

Note that Philips latest mains LED bulbs use an external phosphor
screen with a range of phosphors therein.


    R



>
> Once you have captured the image you can replay it with 3 monochrome
> sources (R, G and B). The "fourth" yellow colour of some LCDs degrades
> colour rendition but improves brightness.
>
> Each of the "red", "green" and "blue" =A0sensitivity of eye (possibly a
> 4th near UV in some people) is almost the entire visible spectrum as
> three curves with peaks. Any camera sensor should have similar
> overlapping continuous curves and any light source that gives appearance
> of scence similar to daylight needs a continuous spectrum. You actually
> automatically compensate for colour temperature. A scene will only seem
> "orange" in tungsten light if there is closer to daylight source also,
> so can be perfectly corrected in software.
>
> But if you use a discontinuous spectrum light source and/or image sensor
> without the requisite curves, then the colour information doesn't exist
> to be corrected.
>
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