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.