flat colors in PDF export

[frits]

Hi to you all,

I 'm using XDP pro X and made a logo for some friends of mine and exported it to PDF using commercial printing PDF X. When you look at the pdf the colors are a bit more flat than in the PNG or JPG export. Also you can see an aditional line in the black line arround the stones. Does anybody have a clue how I can get the same colors as with JPG export and get rid of the line?

Regards,
Frits