Re: Warnings when using an icc profile to pre-condition a higher quality targen command
Re: Warnings when using an icc profile to pre-condition a higher quality targen command
- Subject: Re: Warnings when using an icc profile to pre-condition a higher quality targen command
- From: Graeme Gill <email@hidden>
- Date: Mon, 26 Feb 2018 12:33:07 +1100
Rob Wignell wrote:
Hi,
> My next step is to use targen with a "pre-conditioning" icc profile as a
> "-c" input.
> However, in doing so, the targen processing produces a huge number of
> warnings about
> "vertex location solving failed ..." and "Unable to locate vertex at node
> comb..." (see
> details below).
typically this is targen struggling with non-linearity in the space. Doing
adaptive Voronoi type tessellation in a non-linear/non-cartesian space is
more of a heuristic than an exact mathematical algorithm, and if the space
is sufficiently badly behaved, you get complaints like the above.
> My question is do these warnings have an effect on the quality of the
> resulting "ti1"
> file?
They are a hint that there could be problems. You should be careful in
evaluating
whether using such a preconditioning profile is beneficial or not.
Another thing you can try is to increase the smoothing when making the
preconditioning profile (colprof -r parameter).
> I am hoping to understand what elements increase the gamut volume and this is
> my
> current line of experimentation.
I doubt much to do with the profiling process will increase gamut volume, bar
the TAC. You need to change operation of the printer and/or driver itself
to change gamut volume - i.e. changing ink channel maximums, type of ink,
screening
patterns etc.
Cheers,
Graeme Gill.
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