png output with transparency and the option to have the rendering cropped to the score

[Bart Deruyter]

Hi,
I have asked on the mailinglist how to output the lilypond file to a png with
transparency and cropped to the score itself. It seems not to be possible in
lilypond natively, but it would be very usefull.

When creating a book with many, short pieces of music, it is handy to have high
resolution png's with transparency, so they can be combined with differently
colored backgrounds and images. Of course there is the option to render to svg,
and edit the svg file, but that is a step too many when dealing with lot's of
images. 

It would be great to see this feature appear in lilypond to render to png with
transparency, and the option to crop to the score itself, without page
background, nor margins.

Thanks,

Bart Deruyter