Re: Color accurate workflows (was in search of a D50 Editing colorspace)
Re: Color accurate workflows (was in search of a D50 Editing colorspace)
- Subject: Re: Color accurate workflows (was in search of a D50 Editing colorspace)
- From: Ernst Dinkla <email@hidden>
- Date: Fri, 05 Sep 2014 15:24:40 +0200
Scanner CCFLs are not spectrally similar to daylight and certainly not D50.
The old Agfa Horizon that I had was possibly the exception with its Xenon
halogen light. In a way it is not needed on most scanners when they aim at
the chromogenic CMY dyes of photography and then an IT8 target made with
CMY dyes is also appropriate. Of course IT8s for slides bring back the old
discussion Kodachrome versus Ektrachrome targets.
If the reflective originals have other and unpredictable colorants like
paint pigments + the influence of paint media then D50 lighting could make
sense. But there are other sound approaches like the dual scan with
different CCFLs of the HP G4010/4050. More or less nailing the pigment
colors by their metamerism like the real high end multi spectral art
reproduction methods do even better. Both methods do not have to rely on
continuous spectra, daylight or D50. At least a ColorChecker Passport based
on more pigments should be used for non photographic color originals and
why not scan "RAW" and profile for that workflow so use the tools for
camera RAW profiling?
--
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
April 2014, 600+ inkjet media white spectral plots.
On Fri, Sep 5, 2014 at 3:56 AM, Lars Borg <email@hidden> wrote:
> Peter,
>
> Your scanner problem seems odd to me.
> Few scanners have a D50 light source.
> My scanner's light looks more like 6500 - 7000 K and is most likely not
> spectrally similar to daylight.
> But it reproduces my macbeth chart quite well.
> On-screen the scan matches my reference chart.
> A print of the scanned chart compares well with the physical chart (not
> perfect, but that's due to the printer & paper, not the scanner.)
> In particular, the "white" patch comes out "white" on print.
> Further to note, the scanner output is in a non-D50 color space.
> So what's not supposed to be working?
>
> Lars
>
> -----Original Message-----
> From: Peter Miles <email@hidden>
> Date: Thursday, September 4, 2014 11:51 AM
> To: ColorSync List <email@hidden>
> Subject: Color accurate workflows (was in search of a D50 Editing
> colorspace)
>
> >However unless the scanner space white point happens to be D50, any
> >attempt to move the absolute color meaning of pixels out of the scanner
> >colorspace using Adobe will fail.
>
>
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