Hope some ascii is ok:
Monitor - Rgb'
RGB +-----------------+
+-------+ | +-------+ |
| | | | | |
| | | | | |
| | -------------------------> | | | |
| Image | | | Image | |
| | | | | |
+-------+ | +-------+ |
+-----------------+
Monitor - Cmyk'->Rgb''
RGB +-----------------+
+-------+ | +-------+ |
| | | | | |
| | | | | |
| | | | | |
| Image | \ > | | Image | |
| | \ / | | | |
+-------+ \ / | +-------+ |
> Cmyk' Proof / +-----------------+
RGB Inkjet - Cmyk'
+-------+ +-------+
| | | |
| | | |
| | -------------------------> | |
| Image | | Image |
| | | |
+-------+ +-------+
The first shows the normal displaying of a usual image.
The second tries to simulate the inkjet colours.
The thierd does the usual separation into print colours.
I hope this helps in understanding that proofing is almost always bound to
using a monitor for simulating a different device.
As always, exceptions belong to real live.
kind regards
Kai-Uwe Behrmann
--
developing for colour management
www.behrmann.name + www.oyranos.org
Am 01.03.08, 17:32 +0100 schrieb Frédéric Mantegazza:
> On samedi 01 mars 2008, Kai-Uwe Behrmann wrote:
> > Am 01.03.08, 13:03 +0100 schrieb Frédéric Mantegazza:
>
> > > I added the "set alarm codes" support in the python ImageCms module,
> > > and found that it the destination profile is CMYK, then, values given
> > > to cmsSetAlarmCodes() are CMY, and not RGB!
> > >
> > > Is it a know issue, or a normal feature?
> >
> > Normally one would proof to RGB - the monitor device. There it makes
> > sense to show gamut warnings. It is not intended to print a gamut
> > warning :-)
>
> The *proof* device needs to be in RGB space, I agree, but not the
> *destination* profile. Usually, proofing is done to see how a print image
> will look like. So, it has sens to have a destination profile in CMYK
> space.
>
> Or I missed something...
>
> --
> Frédéric
>
> http://www.gbiloba.org-------------------------------------------------------------------------
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