Hands down my favorite feature of Keynote is the Instant Alpha tool. It takes out background color and really makes a huge difference when creating presentations with icons and logos. I also do a ton of creative layout and design work in Keynote. With Instant Alpha it functions just like Photoshop.
My only complaint was that although I could export slides as images, I couldn't export images with transparent backgrounds.
I shared this with my buddy Jon Corippo the other night and he mentioned using Preview to do it. I had really only ever used Preview to view .pdf files on my Mac. Jon explained that he builds in Keynote, saves as an image, and then opens it in Preview. The same Instant Alpha in Keynote exists on the "Edit Toolbar" in Preview (VIEW - Show Edit Toolbar). Once you alpha out your background you can export (under FILE) as a .png.
I had no idea.
The Edit Toolbar also allows you to add text and shapes, as well as crop and adjust your image...all for free.
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