[scribus] pxd/x3 export : apparently contains RGB images

[Christoph Schäfer]

On Friday 01 October 2010 17:32:15 eric hanuise wrote:
> On 01/10/10 16:54, Pierre Marchand wrote:
> > Vous (eric hanuise) avez écrit :
> >> On 01/10/10 16:32, Christoph Schäfer wrote:
> >>> On Friday 01 October 2010 12:30:15 eric hanuise wrote:
> >>>> Hi all.
> >>>> 
> >>>> I've exported a PDF as pdf/x3 using isocoated v2 ICC profile.
> >>>> It contains several png images, which are rgb.
> >>>> 
> >>>> As I understand it, the pdf exported by scribus should be cmyk only,
> >>>> and the images converted to cmyk during pdf generation.
> >>>> however, the printer came back to me and told me the pdf contained RGB
> >>>> images.
> >>>> 
> >>>> Have I misunderstood the ability of scribus to convert everything to
> >>>> cmyk on pdf export, or is there some setting I missed ?
> >>> 
> >>> Yes, this seems to be a misunderstanding, and to be honest, it's quite
> >>> common even among commercial printers. The PDF/X-3 standard explictly
> >>> permits RGB imgaes (plus a colour profile) to be included in a PDF,
> >>> which is one of its biggest advantages. In other words: Scribus
> >>> adheres to the standard :)
> >> 
> >> Thanks, bu this does not reply my question :) pdf/x3 is in fact
> >> irrelevant here.
> >> The printer requests cmyk only pdf's, with no rgb images inside it.
> >> How can I provide that to him ?
> > 
> > In PDF export>  colors>  target = printer
> 
> Thanks. This option is greyed out when using pdf/x3 (but shows 'printer').

That's because in PDF/X-3 an image is being included "as is" (RGB recommended, 
but CMYK is still possible). The conversion happens at the printer, using the 
embedded colour profile.

> When using another type of pdf (1.3 1.4 or 1.5) the prepress option does
> not allow to specify the icc profile to be used as intent.

Sure. As the caption says: "PDF/X-3 Output Intent".

> Will the profile defined in color management for printer be used ?
> (I'm using 1.3.7 on ubuntu)

Yes.

> 
> How can I check the saved PDF to know which profile have actually been
> used ?
> Also, how can I check that the saved PDF does indeed only contain CMYK
> objects and no RGB ? (Using tools available on linux)

By opening the PDF file in a text editor (may take some time, though, 
depending on the speed of your CPU).

HTH,

Christoph
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