Re: Converting from rgb to cmyk
On Sat, May 06, 2006 at 10:39:50AM +0930, David Purton wrote:
> On Fri, May 05, 2006 at 11:17:50PM +0200, Søren Christensen wrote:
> > On Fri, May 05, 2006 at 10:59:04PM +0200, Søren Christensen wrote:
> > > On Fri, May 05, 2006 at 07:35:13PM +0000, Olafur Jens Sigurdsson wrote:
> > > > Þann 2006-05-05, 19:43:08 (+0200) skrifaði Søren Christensen:
> > > > > I have some jpg-graphics, that I need to use in a leaflet-folder, that
> > > > > shall be printed in offset.
> > > > >
> > > > > The jpg-graphics are in rgb-colormodel, but the printer would like to
> > > > > have them in the cmyk-model.
> > > > >
> > > > > How can I convert between these models? Gimp doesn't seem to give that
> > > > > as an option.
> > > >
> > > > Umm, this is a shot in the dark, but just to be the first to try and
> > > > point you to something I suggest you have a look at the Imagemagick
> > > > tools.
> > >
> > > Perhaps, that would be a good guess, but the documentation does not give
> > > me a hint.
> > >
> > > convert can have the option -type with several values, "ColorSeparation"
> > > being my best guess, but the documentation is not giving an answer.
> > >
> >
> > Need to correct myself.
> >
> > convert -colortype CMYK did the job.
> >
>
>
> Be careful! This will (probably) give you a transformation to CMYK
> without using colour management. When your picture is printed, you will
> likely be disapointed with the results.
>
> There is a colour separation plugin for the gimp which is probably the
> easiest way for you to do this.
>
> You can read about it, how to get it and use it from here:
>
> http://www.blackfiveservices.co.uk/separate.shtml
>
> You can ask your printer for a colour profile to use in the conversion.
>
> There is also quite a lot about colour management on the Scribus
> website: www.scribus.net
>
Thank you very much.
/severino
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