[argyllcms] Re: ColorMunki Photo and Canon Selphy CP-400

The native driver is so good from srgb that it is a waste of time
profiling, at least on my selphy 300

Edmund

On 5/20/11, k2mil@xxxxxxxxxxxxxx <k2mil@xxxxxxxxxxxxxx> wrote:
> Hi,
> Edmund, can you tell me, what is wrong with native driver?
>
> argyllcms@xxxxxxxxxxxxx napisał(a):
>  > i used Monaco amd a DTP 70 several years ago to profile a Selphy 300
>  > with a 343 step target on two cards. I think one superwide card might
>  > suffice. However in the end i gained little in quality; every change
>  > of paper and ribbon really needs rerunning the profile.  if you have
>  > thr native driver, forget it, if another dtiver, email me and i will
>  > run you a profile on dtp70 or isis provided you add a picture postcard
>  > to the target cards :-)
>  >
>  > Edmund
>  >
>  > edmundronald at gmail dot com
>  >
>  > On Friday, May 20, 2011, Nikolay Pokhilchenko <nikolay_po@xxxxxxx> wrote:
>  > >
>  > > Preliminary profiling helps the targen to take real device response in
> account. Preliminary profile can't limit target gamut, it only shows target
> gamut on real device not the gamut on generic printer. There is no aims to
> limit gamut. There is other aims.
>  > > If device response is known, targen able to place test points in whole
> gamut volume more effectively. For example, if device is prone to dark
> tones, without preliminary profile, targen will place the patches uniformly
> in device space. As a result the target will characterize the darks better
> than the lights. In some cases with non-linearized devices with dense
> printing, the result without the preliminary porofile is unacceptable. If
> there is correct preliminary profile, targen places more light patches and
> less dark ones, so resulting target will characterize the darks and lights
> both the best way.
>  > > Another aim of preliminary profile is robust chart recognition. The
> predicted colors in ti1 file will be much more exact. Exact colors helps the
> printtarg place the patches on the target while chart generation, helps
> the chertread recognize the patches and the strips while reading. The strip
> reading of the chart may be unreliable or even impossible without
> preliminary profile for non-linearized device.
>  > >
>  > > Fri, 20 May 2011 11:43:00 +0200 пиŃŃПО ĐžŃ "Stefan - ooge.com"
> <stefan@xxxxxxxx>:
>  > >
>  > > as far as i understand you limit the color space boundaries and have
>  > > more "space" for needed colors.
>  > > results in smaller targets with same quality of resulting profile.
>  > >
>  > > but i haven't big experience with that. may you can try out and share
>  > > your results :)
>  > >
>  > > best,
>  > > Stefan
>  > >
>  > > Am 20.05.2011 10:52, schrieb k2mil@xxxxxxxxxxxxxx:
>  > >>> Hi Krzysztof,
>  > >>>
>  > >>> yes, you can make "pre-conditioning targets".
>  > >>
>  > >>> http://www.argyllcms.com/doc/targen.html#c
>  > >>>
>  > >>> best,
>  > >>> Stefan
>  > >>
>  > >> Hi
>  > >> Stefan are you sure, that preconditioning is not only limiting color
> space boundaries known from existing printer profile? Maybe I am wrong, but
> IMHO it is for avoiding color values out of device color space.
>  > >> Krzysztof
>  > >>
>  > >>
>  > >
>  > >
>  > >
>  >
>
> --
> Krzysztof Tomczyk
> tel. 609187077
>
>
>

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