png format

[Eyolf Ostrem]

I'm preparing some music examples for a book. I therefore use a non-standard 
page format. When I preview the files in a ps/pdf viewer, they look right, 
but when I output them to png files with lilypond --png, they still occupy a 
whole a4 page (as far as I can see; I haven't checked the exact dimensions). 
Is there some way to do this so that I won't have to manually crop all the 
files in gimp first?

Eyolf
-- 
After an instrument has been assembled, extra components will be found
on the bench.