Bob_P...@adobeforums.com
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I am currently using .png files with transparent backgrounds and dropshadows. These are significantly larger (2x or 3x) than the equivalent .jpg files so the site loading time is also much longer but, of course, .jpgs don't allow transparency. My sites are in Flash which, via ActionScript, allows me to apply drop shadows at runtime to transparent images. It also allows me to create a transparent bitmap image from a .jpg by setting to transparent all pixels that have the matte colour. Unfortunately, as I described above, not all the pixels in the matte area will retain the matte colour because of the way the JPEG compression is done. As a result, the cut out image created by ActionScript will not have clean edges. I can fix this by the second operation on the .jpg I've described but this process is not easily automated in an Action and one site in particular involves a lot of images!