[argyllcms] Re: rgb printer calibration
- From: Radek Doulik <radek.doulik@xxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 23 May 2010 21:52:01 +0200
On Sun, 2010-05-23 at 21:34 +0200, edmund ronald wrote:
> Maybe printing in 16 bit space thru the printer driver might help?
>
> One could generate better values close to white that way.
Yup, we use 16bit path until we reach the 8bit driver. Everything looks
nice and smooth on display with hardware LUT, but the proof shows issues
in soft shadows. So I am quite sure the original images are OK.
Cheers
Radek
> Edmund
>
> On Sun, May 23, 2010 at 3:13 PM, Symphony Photography
> <symphonyphoto@xxxxxxxxx> wrote:
> >
> >
> > 2010/5/23 Radek Doulik <radek.doulik@xxxxxxxxxx>
> >>
> >> I have already profiled the printer without calibration, but I see
> >> problems in gradients close to white when using perceptual intent (for
> >> example soft shadows on white background are not smooth).
> >
> > Radek,
> >
> > With regards to smoothness of the profile I've noticed that even if your
> > printer is fairly linear you might see some anomalies using the default
> > settings. Assuming things are fairly linear the following might help when
> > generating the profile:
> >
> > colprof -v -qu nameOfInputFile
> >
> > The -q argument sets the quality. u is the highest setting. It will take
> > longer to generate the profile but consider how fast most machines are these
> > days it's quite trivial. Just grab a cup of coffee and it'll be ready by the
> > time you're finished.
> >
> > Now, if the printer is experiencing some non-linearities in that area the -q
> > argument won't do a lick of good.
> >
> > Cheers, Joe
> >
> > --
> > Symphony Photography
> > http://www.symphonyphoto.com
> >
>
>
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