Transparency in images files can be quite convenient, especially if you need to place the same image over different backgrounds and want it to properly blend in. While having a white or other solid color background may help you view the image on the screen, with this setup if you embed it in a document with a different-color background then the white will stand out as an obtrusive rectangle.
To help reduce this, you can both manually remove backgrounds from images using Apple's Preview application or use a transparent canvas to compile images that already contain transparency.
With the Instant Alpha tool, you can highlight areas (in pink) that will become a selection you can then delete.
(Credit: Screenshot by Topher Kessler/CNET)To create a transparency in an image that has none, you simply need to remove a section of the image. There are several ways to do this in Preview, including the basic rectangle and elliptical selection tools, or the magic lasso option for a selection that has an irregular shape, and then press the Delete key to clear the selected area of the image and make it transparent. In addition you can use the Instant Alpha tool, which will better follow the contours of shaded areas and in some cases give you a smoother way to select contents and make it transpare... [Read more]
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