[scribus] PDFX3, CMYK and opacity

[Peter Nermander]

> The printer requests PDF X3.

> As a result, printer says "some pictures are CMYK and some are RGB in your file".

That is the whole point of using PDF/X-3: It allows the content to be
mixed and leaves the CMYK-conversion to the RIP/printer.

>From the Wikipedia article on PDF/X:
"For example, in PDF/X-1a all fonts need to be embedded and all images
need to be CMYK or spot colors. PDF/X-3 accepts calibrated RGB and
CIELAB colors, while retaining most of the other restrictions of
PDF/X-1a."

If your printer requests a "CMYK only PDF/X-3" you should ask him why
(and explain to him that it seems contradictory). It seems more as if
what he wants is PDF/X-1a.

/Peter