Re: To Scramble or not to scramble
Re: To Scramble or not to scramble
- Subject: Re: To Scramble or not to scramble
- From: Steve Clark <email@hidden>
- Date: Sun, 30 Apr 2006 13:01:32 -0700
I've always let my targets set at least 24 hours before reading them.
Mainly for the color to stabilize and for the ink to be sufficiently
dry to eliminate marking in the 41. I also use surgical gloves when
handling the targets whilst trimming and reading them.
Clark
On Apr 30, 2006, at 12:36 PM, Peter MacLeod wrote:
From: Scott Martin <email@hidden>
[...]
Although patch scrambling has advantages when profiling
presses, your Epson and Iris printers should be so consistent
left to right and top to bottom that there is no advantage to
scrambling. If you have less measurement problems with
unscrambled testcharts then you should feel good about using
them on these printers.
In my experience there are a couple of other reasons to scramble a
test
chart (I've only done it with my own software, so I can't comment
on the
issues you have with measuring them): first, some spectros drift a bit
as they get warmer. Second, the output from many inkjets changes
quite a
bit over a few hours as the ink dries, and I never could get anyone
doing measurements to wait for the prints to completely dry, so if the
spectro takes a long time (e.g. SpectroScan) then the last patch
can be
significantly drier than the first. If you scramble the test chart you
distribute the error uniformly. If you don't, you get systematic
errors
which are much more visible.
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