[swfmill] Does swfmill have any options for image compression

[Walton, Lynn]

I've been playing around and think maybe I have an answer to my own
question. But, since I haven't much confidence, what do you think of the
following Ralf?

identify -format "%[fx:a]" my.png

It seems to return 0 for ones with no alpha channel and 1 for ones with.


I had also come up with greping the output of identify -verbose, looking
for alpha:  in between the Channel depth: and Channel statistics:
headers, but obviously the -format is more elegant if it is going to be
a reliable way to determine if an alpha channel is present. 

So my psudeocode algorithm would be something like  

If identify -format "%[fx:a]" my.png  returns 1  Then do:
   convert my.png -quality 80 -fx "u*a" my.jpg
   convert my.png -channel matte -negate -separate -depth 8 -type
Grayscale myMask.png
   Put <clip id="my_mc" import="my.jpg" mask="myMask.png"/> in my simple
movie xml. 

Else Do:
   convert my.png -quality 80 my.jpg
   Put <clip id="my_mc" import="my.jpg" /> in my simple movie xml.


Thanks,
Lynn

-----Original Message-----
From: Walton, Lynn 
Sent: Tuesday, May 13, 2008 6:02 PM
To: 'swfmill at osflash.org'
Subject: Re: Does swfmill have any options for image compression

Hi Ralf and others, 

> This should work with every png file with an alpha channel.
> Ralf

Sorry to be a pain, but would you happen to be able to tell me the way
with ImageMagick to be able to tell if the png file has an alpha
channel? 



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