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@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? This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ swfmill mailing list swfmill@osflash.org http://osflash.org/mailman/listinfo/swfmill_osflash.org
