Does swf provide better compress rate than zlib for png image?

Posted by Huang F. Lei on Game Development See other posts from Game Development or by Huang F. Lei
Published on 2011-01-12T06:58:19Z Indexed on 2011/01/12 7:58 UTC
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Filed under:

flash

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image

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swf

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compression

Somebody told me that when a png image is stored in swf, it's separated to several layer, hence the alpha channel can be compressed better. Is it true? Or, once png image is imported into a swf, it's format is changed, e.g converted into bitmap data, and than compressed by swf's compress algorithm. That's, it is not in png format anymore.
I don't know how swf packing its resource, please tell me if you know.

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