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Re: TIFF RGB in PS6 as Working Space.
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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


References: 
 >Re: TIFF RGB in PS6 as Working Space. (From: email@hidden)
 >Re: TIFF RGB in PS6 as Working Space. (From: Jan Steinman <email@hidden>)

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