Re: Images and TAC values
Re: Images and TAC values
- Subject: Re: Images and TAC values
- From: Martin Orpen <email@hidden>
- Date: Fri, 12 Dec 2014 00:40:06 +0000
On 12 Dec 2014, at 00:20, Mark Stegman <email@hidden> wrote:
>
> This means that the Gamut View in Photoshop, which must be comparing Lab coordinates as it describes appearance, is telling you that the colours are out of gamut or beyond the limits of the colour space for a specified printing condition and profile. It does not tell you if that profile is appropriate for the specified printing condition and will not care what the TAC is. It is only concerned with the appearance of the colour.
But this would be trivial for Adobe…
Almost as trivial as them making the Desaturate command (shift-command-U) work in CMYK — so I won’t hold my breath :-)
If I feed CMYK values into ISO Coated v2 (300) I can get Lab values back.
At 300% TAC the L values are around 9.8.
At 400% TAC you get L values of 8.7 — which aren’t achievable, but they are still returned by the profile.
Why can’t anything lower than the L value at the TAC limit be given a gamut warning?
--
Martin Orpen
Idea Digital Imaging Ltd
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