[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 ?
> //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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