[scribus] PDF export - Use color profile option?

[Staffan Melin (Oscillator)]

Hi!

When exporting a printer-ready PDF the Save as PDF/Color tab has the
option "Use Color Profile" (with hover help box: "Embed a color
profile for images"). What does this do?

When not selected, my final PDF increases drastically in size (+50%).
When selected, my images are not converted to CMYK (although my Output
intended for is "Printer"). Is this a PDF X-3 option?

(I'm exporting to Acrobat 6/PDF 1.4. Running Scribus 1.4 on Ubuntu 12.04.)

Thanks!

Staffan
SWEDEN

-- 
Staffan Melin
Oscillator - ord bild form
Kryssdäcket 1
SE-413 27 GÖTEBORG
SVERIGE/SWEDEN
www.oscillator.se
staffan.melin at oscillator.se
+46 (0)70-4876 250