Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: "dpascale" <email@hidden>
- Date: Wed, 27 Feb 2008 21:44:12 -0500
That sounds fair!
Thanks for the added info.
Danny
----- Original Message -----
From: "Graeme Gill" <email@hidden>
To: <email@hidden>
Sent: Wednesday, February 27, 2008 9:15 PM
Subject: Re: Photoshop Gamut warning vs ColorThink
dpascale wrote:
What I need to do next is a detailed comparison between the Photoshop
clipping flag, the Argyll xicclu values, and what is measured. So, at the
moment, I cannot say which one (Photoshop or xicclu) is closer to
"reality" (on average!), with reality being the printed result, which
needs to be done with a fresh calibration, controlled conditions, etc.
As already noted, the purposes are slightly different between
the two approaches. xicclu will indicate in/out of gamut
for individual colors using the chosen A2B table as the reference,
and any provided total ink limit. The degree of out of gamut
is in reference to it's choice of clipping (by default
a minimal delta E type). It doesn't take into account
any gamut mapping that would occur in transformation
of a B2A table, nor the exact choice of ink limiting
in a B2A. In addition, a CMYK B2A table will often restrict
the gamut in dark colors to give better continuity (smoothness)
of device value interpolation (Harold would use the term
"tapering"), which is a constraint spot colors conversions
don't have. In practice the xicclu result is basically
a colorimetric test, and so would only be applied to
a gamut mapping situation if the gamut mapping was applied
separately and prior to the in/out of gamut check.
Graeme Gill.
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