adding graphics with external program

[luis jure]

dear list,

i'm mostly finished with the lilypond part of my first LP project, but
i need to add a few graphics with an external program (i gave up trying
to use LP for this).

i'm on linux and i tried both inkscape and scribus, but after fighting
the whole weekend i really can't find a way. inkscape can't open the ps
files. i can open the pdf's, but after editing and exporting, the fonts
are all wrong. with scribus the problems are rather the opposite: it's
the pdf's that i can't open, and i don't know why the ps files open but
with some parts chopped. neither inkscape nor scribus can open the svg
files.

what are the rest of you using when you need to edit the graphics of a
score generated by LP? i'm on linux, but i could eventually use a
windows machine.

any help would be greatly appreciated.

best,

lj