Re: How to make a linearization ?
Re: How to make a linearization ?
- Subject: Re: How to make a linearization ?
- From: Graeme Gill <email@hidden>
- Date: Tue, 26 Aug 2003 11:04:45 +1000
Ray Maxwell wrote:
>
to correct some problems you may introduce. As well as looking at density,
>
I suggest that you plot the a* and b* values for each color step wedge. You
>
just plot the a* vs. b* from you CIELab measurements. When you do this you
>
will find that some ink and paper combinations cause the Hue to change and
>
the chroma to decrease at the point that the inks reach saturation. You
>
should set you ink limits so that you don't go past the maximum chroma
>
point. Please note that this is another "rule of thumb". When we chose ink
Of course you may be unnecessarily reducing your available gamut if
you do this. There would be good reason to limit the maximum
value of a colorant that "doubles back on itself" in its 3D trajectory
(since non-monotonic behaviour isn't useful, and is difficult to deal
with in a profiling application), but note that any colorant trajectory
is unlikely to be a perfectly straight line, and hence can always be made to
appear to "loop back" when projected onto a carefully chosen 2D plane. The fact
that a colorant trajectory looses chroma at high densities might be disappointing,
but it is not actually a problem that needs correcting if it is still extending
the 3D gamut.
Graeme Gill.
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