[argyllcms] Re: RGB printer profile - make black point blacker

  • From: Anders Torger <torger@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 17 Feb 2015 09:22:58 +0100

To clarify, what I'd like to do is to make something similar to the -k 
parameter to dispcal, but for RGB printer profiles. That is reduce 
black point hue correction to increase dmax.

Is this possible?


On 02/16/2015 10:22:09 AM, Anders Torger wrote:
> When making inkjet printer RGB profiles I've noted that the black
> point 
> may differ a little from the white point, ie they are not on the same 
> neutral axis, which is not surprising. The black ink may not have the 
> exact same hue as the paper white.
> It seems like when I generate a profile the black point is
> compensated, 
> ie some colors are added in to move it in under the white point along
> a 
> perfect neutral axis. Naturally this is the most correct way. 
> However,
> maybe one would prefer to maximize blackness (and thus maximize dmax) 
> rather than having a perfect neutral axis, that is black in a printed 
> image would result with a R,G,B=0,0,0 output.
> Is it possible to feed some parameters to colprof to make this type 
> of
> choice? It seems like you can do such things with a CMYK profile 
> using
> the -k parameter, but not with RGB profiles?
> I don't know yet if making this type of optimization actually is a
> good 
> idea or not, but it's something I'd like to test.
> /Anders

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