Re: About ProPhoto RGB
Re: About ProPhoto RGB
- Subject: Re: About ProPhoto RGB
- From: Marco Ugolini <email@hidden>
- Date: Sun, 11 Sep 2005 18:06:28 -0700
In a message dated Mon, 12 Sep 2005 10:54:27, Graeme Gill wrote:
> David Harradine wrote:
>>
>> [snip]
>>
>> There are no colours in Adobe98 that are out side of ProPhoto, the issue is
>> A98 is D65 and ProPhoto is D50, and this is not being accurately allowed for
>> in ColorThink 2.1.2.
> Sounds like ColorThink is being entirely accurate. If two profiles have
> different white points, then one device gamuts is not likely
> to entirely overlap the other (not unless one profile is running
> with a non-full brightness white point). Whether the conventional
> meaning of "gamut" (which I take to be the range of CIE values a device
> can reproduce) is what is meaningful to users in this context, is
> an interesting point. I would guess that what you are pointing out
> is that if ColorThink had an option of comparing white point matched
> gamuts, then ProPhoto would entirely overlap Adobe98.
I don't claim to understand this entirely, but it seems to me that Mauro
Boscarol's point was that if one compares the 2 spaces in XYZ (before
chromatic adaptation kicks in), then AdobeRGB proves to be completely inside
ProPhoto RGB.
Which makes me wonder whether it will be possible to map XYZ chromaticities
in the upcoming ColorThink Pro. The current 2D graphing function in
ColorThink 2.x, from what I understand, is just a slice of CIELAB, not an
XYZ diagram.
--------------
Marco Ugolini
Mill Valley, CA
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