site_archiver@lists.apple.com Delivered-To: pro-apps-dev@lists.apple.com User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080421 Lightning/0.9pre Thunderbird/2.0.0.14 Mnenhy/0.7.5.0 -- . . . . . . . . . . . . . . . . . . . . . . . . . Gary Oberbrunner garyo@genarts.com GenArts, Inc. Tel: 617-492-2888 955 Mass. Ave Fax: 617-492-2852 Cambridge, MA 02139 USA www.genarts.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.ap... Paul Schneider wrote: One reason why many compositing applications prefer working premultiplied is that the typical "over" operation is so much simpler; The other big reason is it allows for emissive foreground images (bright but fully transparent, like a lens flare). Many optical effects never look their best in a non-premult compositing system. This email sent to site_archiver@lists.apple.com