Re: What color do SWOP neutral builds create?
Re: What color do SWOP neutral builds create?
- Subject: Re: What color do SWOP neutral builds create?
- From: Randy Norian <email@hidden>
- Date: Fri, 25 Jun 2004 10:29:40 -0500
Thanks very much, Dan. That helps a great deal- as this shop has
the proofer set to make a neutral at 50c, 39m, 39y I will sit pat on
that for the time being. Your comment about tolerance is well-taken,
I need to keep that in mind.
Originally we had tried calibrating the proofer to match press dotgain,
till we realized there were no ink trapping issues on a Polaproofer and
it was getting too heavy in the 3/4 tones and beyond. At that point we
tried calibrating to make neutral builds with 'typical' L values to
suit and have much more success. The operator simply monitors the Lab
readings from quarter tone 3C neutral + K swatches , and tweaks when
necessary to keep it there.
Thanks to everyone for shedding some light on this topic- this lets me
move on to part 2 of my puzzle! (the profiling)
Randy Norian
On Thursday, June 24, 2004, at 10:29 PM, Don Hutcheson wrote:
Randy,
In absolute intent, U.S. Web Coated (SWOP) v2, which is an excellent
incarnation of TR001, produces a neutral gray with 50c, 40m, 37y.
In relative intent (subtracting paper color) (SWOP) v2 produces
neutral gray
with 50c, 41m, 41y.
For practical purposes you can safely average the effective gray
balance
ratio to be about 50c, 40m, 40y, and future editions of SWOP and
GRACoL will
give these as the official aim points.
Bear in mind that printing to a gray balance tolerance of +/- 1/2
percent M
or Y is impractical, so any definition of gray balance has to have
some kind
of tolerance.
Don
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