[Inkscape-user] color print

Hi,

I started using Inkscape 6 weeks ago. I went to a print shop to get a color drawing - exported as PNG - printed. On this print, a blue gradient fill turned into a blue to dirty-green fill.

Do you have to transform color space afore?

How do you usually do this?

Convert PNG to TIF, transform RGB to CMYK with embedded profile?

Make a PDF/X-3 via Scribus?

If via SVG import, how do you handle tranparency?

What standard color profile do you use, if you don't know exactly on which machine you are going to print?

Or was this color shift just caused by a misconfiguration of Photoshop in the print shop?

Thanks in advance for your help.

HL