What if you use GS to do PS to PDF instead and embed that? Would Cairo let you? (For the PDF backend I mean)
Also, how does ImageMagick implement PS to PNG conversion? I wonder if their approach might inspire us, or whether having an optional dependency would be an idea to consider (if you have imagemagick and/or use some option to Lily you get one behaviour vs the other). L On Sun, 1 Jan 2023, 12:36 Jean Abou Samra, <j...@abou-samra.fr> wrote: > Le 30/12/2022 à 13:08, Jean Abou Samra a écrit : > > which means figuring out how to do PNGs via the default PS > > backend and GS. > > > I looked a bit at this. > > It's not insurmountable, *but*, alpha transparency is not going > to work. PNG images with an alpha channel will need to be > converted to plain RGB because PostScript doesn't support > alpha transparency, and while GhostScript does have a little > support for it, it seems the only way to have an image with > variable levels of transparency across the image is to draw > each of the pixels separately. > > Does that sound acceptable? > > (For completeness: PNG images in the default SVG backend should be > easy.) >
