Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale 
<stevekale@b...> wrote:
> 
> 
> 
> > From: dfaprinting <dfaprinting@y...>
> 
> 
> > I've said this a couple of times, but will repeat one more.
> 
> Yes
> 
> >If you 
> > are running a RIP that uses CMYK output profiles, you can build a 
BO
> > profile in Xrite's ColorshopX. Might also be possible to build it
> > from measured values, never tried that.
> 
> The whole point is to get one that uses measured data.  Can you 
delete the
> other channels?  Are you sure it doesn't simply edit a profile? 
(profile
> editors such as PM 5 can not do what we want to do here)
> 

The other channels are gone!

There is some way to take the measurements from a file, but I've 
never tried it, wish it had more detail in the "book". I can't 
remember the exact tool you need to do this, there are two that deal 
with black profiles, one is Rich Black, I think the rich black may be 
the one you need. I think the other is called Grayscale, and that 
just mixes the channel to provide for a gray, but it will let you 
convert the image from color to grayscale in almost any application 
including a RIP (is a normal CMYK profile). To see the effect of the 
two profiles, use the 2D profile viewer, after adding the profile to 
the list, you will see it displayed on the XY graph. The BO profile 
can be seen as a small circle in the center. If you look at the 
bottom of the viewer window, there is a drop down list of choices, 
choose the bottom choice, then up at the top of the window is a box 
to display the 2D and 3D views, click that, select the profile you 
want and you will see that no other inks except black get used.

Sorry it's a little vague, I'm trying to do this from memory, and if 
you're on a Mac, things might be a little different.


And as far as the linearity of your printer goes, it can change a lot 
depending on humidity, and temperature, and when you install new 
inks, difference between cart completely full and cart almost empty, 
and maybe a half dozen other things. Being able to relinearize the 
printer might be very nice, depending on how desciminating you are, 
but it can get a little picky to worry about all these things.