Digital BW, The Print

Yes but I think the thing we don't understand is why some profiles allow
these operations and others don't. That is we need, ideally, to figure out
what PS grabs from the ICC profile.



> From: Bob Frost <bob@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Tue, 25 Oct 2005 16:23:45 +0100
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] ICC Soft Proofing -- The issue . . .
> 
> Steve,
> 
> Well, according to Bruce Fraser
> (http://www.creativepro.com/story/feature/15310.html)
> "When both Paper White and Ink Black are unchecked, Photoshop uses Relative
> Colorimetric rendering with Black Point Compensation to go from the
> simulation to your monitor. What that means in English is that the paper
> white is mapped to your monitor's white, and the printer's black is mapped
> to your monitor's black. If you're printing to a bright glossy stock, this
> view is probably the most accurate. But if you're printing to a matte paper
> it may give you an overly optimistic view."
> 
> "The Ink Black checkbox turns off black point compensation in the rendering
> from the simulation to your monitor, and attempts to show you the actual
> black that will appear in print. If you're simulating printing to a glossy
> paper, you'll probably just see a very slight lightening of the shadows. If
> you're simulating printing to watercolor paper, newsprint, or an uncoated
> stock that produces relatively weak blacks, the shadows will likely lighten
> a lot when you check Ink Black. This setting is useful for fine-tuning
> shadow detail, particularly on stocks that produce weaker blacks."
> 
> "The Paper White checkbox makes Photoshop do an Absolute Colorimetric
> rendering from the simulation space to your monitor. It attempts to show you
> the influence of the paper color and also the true black (when you check
> Paper White, it automatically checks, and dims, Ink Black). But to do that,
> it has to dim all the colors -- to change the color of white, it has to
> reduce the values in one or more of the channels that it sends to the
> monitor, because the only way to change the color from RGB 255,255, 255
> (your monitor's white) is to turn something down. As a result, your first
> reaction when checking paper white may be that your image just died before
> your eyes. I've become accustomed to looking away from the monitor when I
> check Paper White so that I don't see the change happen. This simple trick
> makes it a lot easier to accept the paper color displayed on the monitor as
> a true white."
> 
> 
> 
> Bob Frost.
>