Thanks Terry for your advice. I have a couple of other questions.
This is the most critical step. This is where training comes in or
getting a certified BestColor installer to do this for you. The
manual may give you the mechanics of creating the baselin but it
doesn't explain how best to set per-channel limits and linearize.
I see the process for performing the base-lin in the manual and it
looks to be well laid out and easy to follow. I have an i1 pro which I
should be able to use to measure the densities. You mention that it
doesn't explain how"best" to set the ink limits. It says in the manual
to output a "quality of colours" test chart to define per chanel and
total ink limits. Is there more to it than this or does the manual
just make it seem easier than it is to pick the correct patches?
It's actually "Quantity of Colors" and it's used for choosing total ink
limit only. There's actually a new/improved method that uses a
different test target. It should've been part of your install. The
quantity of colors chart isn't very good.
As far as doing the baselin, using density as your measure isn't a
great idea. Myself and others prefer to use Lab/Lch to set the initial
per-channel limits. I personally use Chroma as a metric of where to cut
off the inks. In a nutshell, you want to find where the chroma value
peaks and set your ink limit there (you may want to back off a bit from
this value to avoid ink hue shifts). The peak chroma usually occurs at
a value LESS than 100% ink. Print a step wedge from 0-100% and use your
Eye-One and Measure Tool (Spot function) to find the Lch/chroma value.
Note the ink %.
When you measure your baselin target in Best (first pass), it will
report density values but you simply ignore them and use the ink %
values that you found with your Eye-One+Measure Tool and manually type
them in.
Also, with the baslin density readings, are there only CMYK patches on
the lin test chart, even though there are 7 colours in the 9600?
CMYK only. The light/dark ink conversion is hard-wired in Best.
Is it better to let the RIP do the profile conversions?
You could do it either way. The one advantage of doing the conversion
in Photoshop is being able to use Black Point Compensation,
somethings Best doesn't offer plus, of course, being able to
soft-proof the results prior to printing. But the advantage of
letting the RIP do the conversion is a more streamlined workflow.
I understand now that the RIP recognises embeded profiles in Tiff
files if the "use tiff profiles" check box is checked. In this case
does the RIP then render from the supplied RGB source profile
(Photoshop working space) to the paper profile loaded in the advanced
color settings using the rendering intent next to the RGB Reference
profiles? I am assuming that BEST has it's own CMM built in?
Yes, the RIP will set the embedded profile as source and convert to the
paper profile. The reference profiles in the case would only be applied
for untagged images.
Best has it's own CMM (LogoSync).
I can see where to load a custom profile and linearization in the
advanced color settings and also where to set the profiles for the
simulation (Reference profiles). If you don't want a simulation, do
you simply leave all the reference profiles blank, or do you set the
RGB reference profile the same as the paper profile?
No. Simply select the base linearization you created and leave color
management deactivated. It will still use the baselin and ink limits
but no profiles.
I think I am going to do profile conversions for my stuff in Photoshop
so I will deactivate the colour management but the Owner will probably
want to have it on for outputting work off the street. I would be
inclined to recommend they activate the "use tiff profiles" to render
any files that have embedded profiles and set the default RGB space to
SRGB for any files that come in without a profile.
Just set up two different queues/hotfolders for the two different
workflows.
Cheers,
Terry
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