[argyllcms] Re: Using two cameras to create a (pseudo) profile
- From: edmund ronald <edmundronald@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 21 Jul 2012 13:14:16 +0200
I think Iliah has another script which will allow a monochrome camera Like
the Leica to provide the "look" of a certain obsolete color transparency
process that came in a yellow box. However due to some IP issues, he is
unwilling to share this other script with us.
Edmund
On Sat, Jul 21, 2012 at 12:58 PM, Bernhard Bablok <bablokb@xxxxxx> wrote:
> Am Sat, 14 Jul 2012 14:57:52 +1000
> schrieb Graeme Gill <graeme@xxxxxxxxxxxxx>:
>
> > Bernhard Bablok wrote:
> > > Hi,
> > >
> > > is the following procedure possible with the use of argyll-tools?
> > >
> > > * print a target (e.g. with targen)
> > > * create a cht-file for the target
> > > * take an image with camera A
> > > * create the reference-file from the image from camera A
> > > * take a second image with camera B
> > > * create a profile using the reference-file created with camera A
> > >
> >
> >
> > > I know this is not really the catholic way, but I want to make the
> > > colors of camera B look like the colors of camera A. BTW: "camera A"
> > > could also be a film-camera+film-scanner (even using BW-film).
> >
> > Hi,
> > I'm not sure why you want to deviate from a normal
> > device space transformation. Simply profile camera A and profile
> > camera B, and then create an RGB to RGB space transform from
> > camera B to camera A device space. The transform can be on the fly
> > using a CMM/cctiff or application, or using a device link (collink).
> >
> > ie. to be explicit, you want to emulate this:
> >
> > Scene CIE -> camera A processing -> RGB of camera A
> > -------------- = camera A B2A ------------------
> >
> > with this:
> >
> > Scene CIE -> camera B processing -> RGB of camera B
> > -------------- = camera B B2A ------------------
> >
> > So overall you want this:
> >
> > Scene CIE -> camera B processing -> RGB of camera B
> > -------------- = camera B B2A ------------------
> > -> inverse camera B processing -> Scene CIE
> > -------------- = camera B A2B ------------------
> > -> camera A processing -> RGB of camera A
> > -------------- = camera A B2A ------------------
> >
> > and camera B A2B + camera A B2A is a normal device link.
> > (This ignores any issues with gamut, white point etc.)
> >
> > Graeme Gill.
> >
>
> Hi,
>
> would that also work if camera A is a black-and-white film (+scanner)?
> IMHO, normal profiling for A will always fail, since there are no
> color-values in the measurement.
>
> I'm not through with testing, but taking
> the script from Iliah I might be able to make the results of camera B to
> mimic the results of the black-and-white film.
>
> Bernhard
>
>
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