Re: Photoshop Gamut warning vs ColorThink
Re: Photoshop Gamut warning vs ColorThink
- Subject: Re: Photoshop Gamut warning vs ColorThink
- From: Matthew Larmour <email@hidden>
- Date: Sun, 24 Feb 2008 09:44:31 -0800
- Priority: normal
I believe in many instances the quesion of, "is this (CIELab) colour within the gamut of this device" is rooted in a very practical, rather than theortical, need: attempting to reproduce that colour on the target device. The A2B gamut would tell you if theoretically the gamut is large enough to encompass such a colour, but doesn't provide a means to determine the device values necessary to do so. For this, we need a conversion from CIELab to device values, provided by the B2A tables. So this "effective" or "useable" gamut, produced by a combination of the device's physical gamut, profile, choice of rendering intent, etc, is all we can access unless we work in device space - which in this example isn't possible.
On a related note, what is the best way to determine device values that will match (within some tolerance) a CIELab colour? Simply an Abs Col conversion from CIELab value to device values, or Rel Col, or are there better methods?
Matthew Larmour
> From: email@hidden
> The person who started this thread (Mike Eddington, Date: Thu,
> 21 Feb 2008
> 10:39:31 -0500), asked the following question:
>
> > ... if I want to determine a group of Pantone colors that are
> within a
> particular gamut ...
>
> I would submit that the A2B gamut is more appropriate to provide
> his answer
> than the B2A gamut. He's intersted in the intrinsic properties
> of a
> particular colorant set free of any constraints.
>
> People who want to know if a given color is in-gamut for a
> particular RI of
> a particular Profile when printed on a particular Printer are
> better served
> by the B2A gamut.
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