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[Swftools-common] (patch supplied) Allow swfextract to extract alpha mas
From: |
David Croft |
Subject: |
[Swftools-common] (patch supplied) Allow swfextract to extract alpha mask |
Date: |
Mon, 30 Nov 2009 20:35:38 +0100 |
Attached is a patch for swfextract.c allowing you to extract the alpha
mask from DefineBitsJPEG3 tags. It is against the latest
2009-08-24-2042 source.
When extracting a JPEG with "-j", the new "-a" option can be used to
specify the file to save the alpha channel into (if found). The file
is output as a 8bpp greyscale PNG. This can then easily be combined
with the JPEG as required, for example using ImageMagick:
$ ./swfextract source.swf -j 6 -o extracted-image.jpg -a extracted-alpha.png
$ convert extracted-image.jpg extracted-alpha.png -compose
copy_opacity -composite out.png
Example output: http://www.davidc.net/~david/pics/swftools/
Please accept this patch for the next version of swftools.
Regards,
David Croft
swftools-swfextract-alpha.patch
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