Re: [Swftools-common] data loss in jpeg2swf

[Matthias Kramm]

On Mon, Sep 20, 2004 at 04:01:59PM -0400, Andrew Wheatley wrote:
> How do I prevent data from being lost when I convert a jpeg
> to a swf using jpeg2swf.  I've used -q 100 but I still lose
> data.  When I extract the jpeg from the swf using swfextract
> the extracted jpeg is slightly different than the original jpeg.

jpeg2swf first decompresses the jpeg, then compresses it again
using the SWF version of the jpeg standard.
As jpeg is a lossy format, you will lose some information on the
way, yes.
Notice btw. that in the opposite direction, this is not the case:
A jpeg extracted out of a SWF by swfextract is exactly the same
as it was in the SWF.
Not sure whether there's a way to do a version of jpeg2swf which
works similar, i.e., doesn't have data loss. If yes, it would 
only work for specific types of JPEGs.

Greetings

Matthias