If you have access to Flash Pro, you can import a PNG-32 into the
library, and use the Flash to apply the JPEG compression. Flash will
retain the alpha mask.
There may be other programs that can output a jpeg with an alpha channel
in a swf format like that, but I can't think of any off the top of my head.
Kevin N.
On 2/11/2012 12:43 AM, Ben Sand wrote:
This blog shows how to combine a jpeg with a png alpha mask to get file
sizes down, but it is for HTML5, although they were able to use a flash
converter successfully:
http://blog.jackadam.net/2010/alpha-jpegs/
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