@You : "...It's more straightforward with something that draws shaded polygons and not curves, and you can get that type of image out of MoI currently by exporting to .ai format, if you turn on the Shaded background image option a companion PNG file will be generated along with the .ai file."

Ok Michael. I forgot this chance :)

I will try and let you know if it's good for what I want to do (image composition in very high resolution).

Thanks.