[argyllcms] Re: "RGB"-printer and inversion in blacks
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 03 May 2012 09:45:51 +1000
Nikolay Pokhilchenko wrote:
> I think it can be mode with clipping (the colorimetric intent nature), but
> not just to minimum
> dE. The clipping may have grey monotonicity priority. I.e. If the reverse
> colorimetric
> conversion leads to inversion of the lightness, the new back point should be
> chosen (or another
Hmm. I'm really looking for a consistent set of rules for clipping behaviour,
rather than a fix in just one area. Ensuring monotonicity is quite hard,
since you have to "invent" behaviour that departs from the actual behaviour.
Something like constant hue constrained minimum delta E may give
a more expected result, but once again it's not guaranteed to
be monotonic. Radial clipping (constant hue, radial from the gamut centre or
Lab 50,0,0) will work, but it generally looks very bad, and would be very
far from minimum delta E clipping.
I think you should take a look at the results with my fix, since
it is greatly improved, and is reasonably close to exact behaviour,
which is monotonic in this instance.
Graeme Gill.
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