Re: Lab and visible colours
Re: Lab and visible colours
- Subject: Re: Lab and visible colours
- From: Klaus Karcher <email@hidden>
- Date: Fri, 07 Jul 2006 19:18:33 +0200
Graeme Gill wrote:
One of the interesting corollaries of this, is that
it is theoretically possible to extend the gamut of
a normal CRT or LCD display, by creating an unconventional
profile. Say your LCD display is capable of 200 cd/m^2.
If you could set the white point to be at (say) 100 cd/m^2,
_without_ also constraining the R, G & B levels to also
be halved, then you could (roughly) double your visible gamut.
One way of visualizing this "trick", is if you took
a normal display gamut, magnified it by a factor of 2,
(ie. so it's white point becomes a Y of 200 rather than 100),
and then sliced the top off it so that Y has a maximum value
of 100 again, then you can see that the region above the
conventional gamut is filled in.
[I haven't got around to trying this trick in practice yet,
to see how usable it is. It would help to have a nice bright LCD
display to try it on..].
Graeme Gill.
There is an interesting paper form Heckaman and Fairchild on this:
http://www.cis.rit.edu/fairchild/PDFs/PAP22.pdf
Viewing the example images in Acrobat's full screen mode demonstrates
this "trick" really impressively.
Klaus Karcher
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