Transparancy in png-file is lost when used as source for cover/poster

[Omertron]

Original issue 1212 created by Omertron on 2010-01-19T08:02:53.000Z:

What steps will reproduce the problem?

1. Use a png-file with transparancy (for example rounded edges) as a source
   for the cover/poster
2. Run YAMJ

YAMJ will use the png-file as a source for the cover/poster. However, it
wil convert the png-file to a flat jpg-file before creating the *_small.png
and *_large.png files. This results in the loss of transparancy and, in the
case of rounded edges, creates black corners.