[argyllcms] Re: Black turning down problem (the -r trick)

Hello Graeme

On 13-Jan-2011, Graeme Gill wrote:

> It's quite hard to algorithmically decide the level of smoothing
> that optimizes overall accuracy. I've had a go at it many times,
> using several approaches, with several results. It certainly
> seems that on some occasions the level of smoothing is underestimated
> (some XYZ based cLUT profiles come to mind), although I think
> that you are probably going to extremes. I can imagine that
> doing so does to some degree overcome black topology problems,
> and smooth out the K plane in the result as well, but at a terrible
> cost to colorimetric accuracy.

Surely, that's why it should be an adjustable option in any case, which
one sets after making tests and evaluating the risk-benefit ratio.

> Not really. There is only one A2B table computed, and it's the smoothing
> of that, that you are changing. All the different B2A tables are created from
> that one A2B table.

Yes I know... I meant computing B2A tables in function of a virtually
smoothed A2B table (virtually = smoothed only at search-time, using an
incraesed tolerancy).
Just rambling, of course.

/&

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