Digital BW, The Print

Hmmmmmmmmmm...... Any XY engineers out there? Days of the Forox and compound
tables are starting to raise their nasty heads again. I knew there was a
reason to get my brother to reopen his machine shop.

Jim Davis
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> > Why not a flatbed printer, say 3x4 feet, with 2 sets of separate 6 color
> > heads. The paper would be vacuum held to the bed. One set of heads would
> > make a pass and drop the CMYKLcLm the second head would follow and drop
the
> > next 6 colors. Engineers are smart enough to build such printers now,
the
> > alignment of the two set of heads can already be done. The software side
of
> > it may be a bit of a challange. After reading Dan's post that may also
be
> > relative simple. The big thing would be the cost. You are not going to
be
> > able to buy this printer for $5000.00
> >
> > Jim Davis
>
> Back when I thought I might be able to get reasonable registration between
> two 3000 printers I filled one 3000 with MIS CMYK inks and another with
MIS
> light cyan and light magenta with the remaining two channels reserved for
a
> blue and violet whenever they should appear.  I found I could make a
profile
> based on running the target file the same way I ran the print - make a
spot
> bump channel for the light cyan and light magenta and suppress the regular
> cyan and regular magenta in the highlights.  But that was in Photoshop 5
> days and I needed to do it with two profiles and a curve - one profile to
> convert the RGB to standard printer RGB space and the other (a faux CMYK
> profile) to preview the file as I applied the curve that suppressed the
> highlights while I turned on the bump spot channels.  In other words it
was
> a pain in the rump but showed promise, even with the RGB driver.  But the
> lack of registration between two separate 3000s was pretty much the killer
> of that idea.  Really it is mostly a matter of some sort of multi-strike
> printing with very good registration.  If someone made a printer like you
> suggest and it didn't break the bank I'd be stuffing it with multi-hued
inks
> and spending all my time in experimental bliss - especially since I could
> put in multiple grays as well!
>
> Blatner and Fraser describe how to do a bump plate in Real World Photoshop
> and reference a plug-in that does it automatically.  Not all that hard to
do
> actually - at least not hard compared to some manual quad separation
methods
> - but getting a way to profile and preview the combination of the regular
> inks and the added inks is what becomes difficult (or at least complex and
> confusing).  The spot channel controls in Photoshop only approximate the
> appearance of the resulting print but if you have a large run and can
tweak
> the file until it prints right that might be a reasonable approach.  In
> Photoshop 6 you convert to standard printer RGB space, turn on the RGB
> softproof feature with the black ink simulation feature, then lay in a
spot
> channel and adjust its color and opacity to match a test print.
>
> For experimenters: there is no reason that these bump plates have to be
> limited to non-standard inks on a special printer.  If you can roll back a
> 7000 and reprint or get reasonable double strike capability with some
other
> printer you can bump any standard ink (including the black in quadtone
> printers) by making a spot channel and turning it off on the first strike
> then turning it on (and turning the main image off) on the second strike.
I
> think someone posted something like that on this list about a month back -
> but again, making an *accurate* previewing profile might get pretty nasty.
>
> Dan
>
>
>
>
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