Re: Dry Time for UltraChrome inks/Calibration
Re: Dry Time for UltraChrome inks/Calibration
- Subject: Re: Dry Time for UltraChrome inks/Calibration
- From: Graeme Gill <email@hidden>
- Date: Thu, 06 Feb 2003 16:08:14 +1100
Roger Breton wrote:
>
Could you briefly define "non-monotonicity" so that we can follow the
>
argument? I have observed what Darrian and Ray described in the last series
>
of posts with Robin and I'd be interested to know more about that because
>
I've been intuitively using a similar "algorithm" to calibrating large
>
format inkjet printers.
A sequence { a(j) } for j = 1 to n is called monotonic if
a(j + 1) >= a(j) for all j,
or
a(j + 1) <= a(j) for all j.
More generally, in a mapping from one space to another
the mapping is "monotonic" when there is a unique
mapping of input values to output values. To put it
another way, there is only one input value that
will map to any given output value.
Given that color correction is all about characterizing
a devices behaviour and then inverting the profile in
order to know what device values to use to get a certain
PCS value, reverse mapping uniqueness is a very useful
quality.
Graeme Gill.
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