RE: To Scramble or not to scramble
RE: To Scramble or not to scramble
- Subject: RE: To Scramble or not to scramble
- From: "Peter MacLeod" <email@hidden>
- Date: Sun, 30 Apr 2006 12:36:39 -0700
- Thread-topic: To Scramble or not to scramble
> 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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