HD subtitle ripping (SUPread)

[rica]

Originally Posted by Ulf

I am currently converting my HD-DVD's to Blu-ray. In order to fit the content on a single layer DVD I downscale the movie to 720p and encode with x264. Everything is straightforward, except for downscaling of the subs. I extract the bitmaps to PNG format using SUPread. These are 8-bit PNG's with variable transparency (set in the tRNS chunk of the PNG files).
Neither Photoshop CS nor GIMP reads the full transparency data. I have found that ImageMagick (convert.exe) actually can convert the PNG's to 32-bit (with transparency preserved) and scale them down to 1280x720. Another command-line program, Pngnq, can convert the 32-bit PGN's back to 8-bit with variable transparency.
I now have a BDN XML file (720p) and a set of 8-bit PNG's. Does anyone know a way doing the opposite of what SUPread does, i.e. to create a "sup" subtitle file from a XML file and PNG's?
I have access to Scenarist and I made one Bly-ray compilation with the 720p content. The end result is perfect with subtitles looking as the original (no jaggy outlines). A much easier (and less costly) way would be to use the free tsMuxeR. The only obstacle is the lack of a program that can create a "sup" file from BDN XML file and PNG's. Can anyone help?

Thanks for the post.
I guess SubtitleWorkshop4 will accept your xml.
Please feedback.