Total Dot, Number of Patches & "Reading" Devices
Total Dot, Number of Patches & "Reading" Devices
- Subject: Total Dot, Number of Patches & "Reading" Devices
- From: Bill Whitfield <email@hidden>
- Date: Thu, 25 Apr 2002 14:41:51 -0700
Greetings from the Flexo Guy,
Total Dot: One month or so ago I posted a request for flexo total dot and
max black info. Thank you to the few who responded. We went to press with
a test that was comprised of ramp blocks of cmy with even values in 2%
increments, ie - one block had c=84%. m=84%, y=84%. next block had c=86%,
m=86%, y=86%, all the way to 100%. (this was a variation of a target I
got from Morgan at ColorBlind - thank you Morgan). On top of those ramps
we printed a bar of black in different percentages. We found our lowest L
value with clean printing at 100% black over the 96% block of CMY. The L
value was higher at 98% and 100% CMY.
Number of Patches: I am using ColorBlind and plan to go to press, print
patches and build our first press ICC profile. I plan to use total dot of
288 with a max black of 100. I am using a DTP 41 to read the patches. Is
there an optimum number of patches I should use? I would think I would
like to use "alot" (1400) but this would require many plates and much
press time. In fact it would require 44 plates and about 9 hours to print
3 different substrates. I read sometime back that the number of patches
is not actually the number of LUT's - meaning if I only send 300 patches
to the press there are not only 300 entries in the LUT. Could/would
someone expand on that please. And, is here a way to open up the profile
to see how many points are in the LUT. I have used Chromix ColorThink 1.1
to look at a profile I built for an analog proofer that has 500 patches
and it shows in ColorThink; 8 bit table, 17 gird points from CMYK to Lab
and 8 bit table 33 grid points from Lab to CMYK. What does that mean?
(What a GREAT program ColorThink is to learn about profiling and such -
thank you Steve - is 2.0 on the way soon?)
Reading Devices: Some input please on other reading devices that would
help minimize the number of plates and press time needed to make a
profile. From my reading it appeare that the Spectrolino might be the way
to go. Any comments?
Thanks to all who respond.
-Bill-
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