Re: TIFF RGB in PS6 as Working Space.
Re: TIFF RGB in PS6 as Working Space.
- Subject: Re: TIFF RGB in PS6 as Working Space.
- From: email@hidden (Bruce Fraser)
- Date: Tue, 7 Nov 2000 16:23:38 -0700
At 3:56 PM -0800 11/7/00, Jan Steinman wrote:
>Also, running 5000K is important to those who are extremely picky
about colors, and need to compare with originals under calibrated
lighting sources.
Oddly enough a monitor white point of 6500 seems to offer a better visual
match to a D50 light box... but lets not confuse monitorspaces and
workingspaces...
Well, I'm confused, then. What the heck do the numbers mean, then?
If these are supposed to be color temperatures, then it should mean
the relative mix of define a specified power spectrum, no?
In practice, there's only one light source that produces a D50
spectrum, and it's 93 million miles away.
5000K, (or any other value in Kelvins), when applied to a light box
or a monitor means that the chromaticities match that color
temperature, but there are many different spectra that can produce
the same tristimulus chromaticities -- that's what makes color
matching possible in the first place.
CIE colorimetry was not designed to make cross-media comparisons such
as that between a monitor and a hard copy. Many people have reported
getting better matches between a D50 light box and a 6500K monitor
than between a D50 light box and a 5000K monitor. I suspect that at
some level not taken into account by CIE colorimetry, our eyes detec
the different spectra even when they nominally add up to 5000K, but
cross-media comparisons are an area that needs a lot more science.
Bruce
--
email@hidden