"William Sommerwerck" wrote in message
...
I guess it comes down to definitions and how 'full spectrum' is
perceived.
Rightly or wrongly, I tend to think of it as a spectrum which contains
the
same component colours in the same ratios, as natural daylight...

That's a reasonable definition for a video display, but it's not
sufficient
for source lighting. It's difficult to make a "full spectrum" fluorescent
lamp, especially one that produces good color rendition for photograpy.


but I guess even that varies depending on filtering effects of cloud
cover and haze and so on. Even so, I'm sure that there must be some
definition of 'average spectrum daylight', and I would expect that any
display technology would aim to reproduce any colour in as closely
exact a way as it would appear if viewed directly under daylight.

The standard is D6500, a 6500K continuous spectrum from a black-body
source.
What you suggest is, indeed, the intent.




There is no such standard as D6500. One standard, the one used for most
video for the color of white, is D65. D65 specifies NOTHING about the
spectrum, only the x,y coordinates of the COLOR of light. It happens to be
approximately 6504K. The term D6500 is slang and sloppy use that confuses
the issues of colorimetry and coordinated color temperature.

There are other standards for the color of white that are used for purposes
other than video. Some specific purposes in film and cinema, as well as in
video use other standards, but for the most part D65 is accepted as the
color of white for modern video. The truth is that virtually no consumer
displays come out of the box set anywhere near D65, nor producing correct
color for any color, including white. What you see in showrooms and when
you take a set out of the box is likely a color temp for white that is
nearly twice what it should be.

Leonard