[argyllcms] Re: Printtarg dithering for TIFF output request

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 07 Apr 2012 18:48:16 +1000

Nikolay Pokhilchenko wrote:
> 1) generating the target data with preliminary (from similar device) 
> ICC-profile; 2) generating
> 16-bit TIFF target images; 3) changing the "color depth" of images from 
> 16-bit to 8-bit in Adobe
> Photoshop Elements (the dithering is applying in Photoshop by default); 4) 
> saving 8 bit per
> channel targets.

Hi Nikolay,
        such a thing is certainly possible, and I have some well developed 
stochastic fixed
pattern dither code that could be applied to the task, but I guess I'm a little 
puzzled
by the work flow :- normally in color management you strive to keep the 
profiling and
final used workflows as close as possible, so the question is why the profiling 
workflow
is 8 bit, while the printing workflow is 8 bit dithered ? What is doing the 
dithering
for the normal printing workflow ? Why can't the 16 bit test chart be printed 
via
that workflow ?

> http://www.freelists.org/post/argyllcms/targen-samples-filter-out-bug-v135,1 
> I suppose the
> clarification "Note that some classes of the full spread patches don't 
> support generating the
> total number of patches while being filtered - instead the points are 
> generated then filtered"
> would be appropriate in targen -F option description.

I've added this.

Graeme Gill.


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