Digital BW, The Print

Tyler, you wrote:

> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Ernst
Dinkla"
> <E.Dinkla@c...> wrote:

> Look at it this way, if the profiling software sees exactly the
same
> measurement numbers as the color data in the target file, it
should
> create a null profile. I have yet to take this very far, but
you get
> the point.

That was my approach too some time ago but I couldn't figure it
out.

> Another possibility is that the canned Epson profiles seem to
have
> some sort of shell profile called "standard", then setting
specific
> sub profiles. The 3000 or example installs SC3000 Standard,
then
> several related to media and resolution such as SC3000
PQP_1440. This
> "Standard" seems to be equivalent to ColormatchRGB, but is a
printer
> profile. I haven't tested this thouroughly but it seems to be
true. If
> you can deal with your null profile having a gamma of 1.8, or
can then
> edit it to an more useful overall gamma, you can use it as a
base null
> to edit curves into. It works.

This is interesting, there may be other ways to convert space
profiles to "null" printer profiles. Better ask that question of
null profiles again but this time in the colorsync list.

> >...is it possible to write a tool that translates
> > spectrometer or densitometer greyscale data into a PS curve ?
If
> > it doesn't already exists.
> It certainly seems possible, RIPs that have linearization
features
> built in, that support measurement devices directly, seem to do
> something very similar, just perhaps not  a PS curve
specifically.
> Will they export a .acv curve?

The Wasatch SoftRip has the Spectrocam driver integrated in that
linearisation so it is hard to get the info on the data
conversion. I have asked Wasatch to take a look at the different
workflows of quad printing (through the MIS site) and work out a
universal scheme that allows the integration of B&W printing in
the Rip. The Rip has curves for adjustment and linearisation per
Cc Mm Y K channel.
I have suggested that an overall linearisation after those steps
would be nice to even out any flaws in the curves and at the
cross over of the channels. I have no idea whether they actually
bother about a request from one Dutchman. It seems that
Ergosoft's Posterprint now has Quad support so I am not without
hope.

I will ask a befriended programmer to take a look at the ACV file
and how a Spectrocam reading can be used to make one.
Might even be easier to go to a grey profile directly if any
curve to profile conversion is creating RGB flaws in the process.

> > There's profile creation software that can change a normal
colour
> > profile into a so called "Rich Grey". It is used to get more
> > neutral prints from colour printers by taking out the colour
data
> > of the colour profile (if I did understand it correctly). I
got
> > some samples of profiles and menu screenpics probably from
> > Richard Millott on the Colorsync list. www.ICCtools.com is
the
> > company, the software is ICCtoolbox pro. The profiles have an
> > extension pf but they are cmyk printer profiles, I can't
place
> > them however. Anyone familiar with that application and the
> > profiles ?
> I've downloded it and tried it briefly in demo mode. I tried
making a
> gray profile from a CMYK profile of a quad setup. It did work,
and
> will load and preview, very cool. Just haven't found a way to
put it
> to good use yet.

Nice to know that it can work. No Macs here.

Ernst