[argyllcms] Re: "RGB"-printer and inversion in blacks
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 02 May 2012 07:34:17 +1000
Nikolay Pokhilchenko wrote:
> Is it possible to detect the "rise to a dip" behavior in profiling software
> itself?
Hi,
from the look of the gamut hull, I think the device behaviour is
fairly normal, and it is just a matter of dealing with the consequences of
a device black that is not quite neutral.
> May be there is an automatic work-around method possible
> for such devices? I can imagine that the profiler performs the test like mine
> automatically -
> inverse then forward conversion of a grey gradient and the checking the
> resulting gradient for
> monotonicity. If non-monotonicity is detected, some work-around can be
> performed while profile
> re-computing. I think the gray scale monotonicity is the most important and
> it's will be
> acceptable to check only greyscale inversion.
The intent (colorimetric) is not aiming for monotonicity, it is aiming to
reproduce the color with the minimum delta E. The other intents (perceptual
and saturation) are aimed at smooth and pleasing image reproduction (ie.
monotonicity), while colorimetric would be used for things like spot colors.
I am wondering though, whether there is a general expectation for an
alternate colorimetric intent with clipping behaviour that does not return a
minimum delta E, but instead have some other constraints. What constraints
would that be though ?
Graeme Gill.
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