Digital BW, The Print

> From: Tyler Boley <tyler@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Tue, 25 Oct 2005 22:05:58 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Re: ICC Soft Proofing -- The issue . . .
> 
> I see no consistancy here between the ability to preview paper white
> and/or ink black, and the presence of wtpt and/or bkpt tags in the
> profiles.
> For one odd example, I have 2 profiles here, one will preview paper
> white but not ink black, the other will do the reverse, ink black but
> not paper white. They both have wtpt tags, no bkpt tags.
> This preview ability could also be derived from the LUTs

I agree.  The wtpt tag is mandatory while the bkpt tag is not.  It's either
in the B2Ax tag(s) or the "gamt" tags.  I am not familiar with the latter.
We should probably ask the question over at Adobe's PS forums or perhaps the
Colorsync list.  We here are just guessing.
 
>I would
> think. But why some and not others?
> Another unknown. Along with how to make great art.
> T