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Lesson 14. Optimizing Web Images and Ima... > Specifying background transparency

Specifying background transparency

Background transparency lets you place a nonrectangular graphic object against the background of a Web page; the areas outside the borders of the object are defined as transparent, letting the Web-page background color show through. You can specify background transparency for GIF and PNG images.

Converting the Background into an ordinary layer

Before you can use the GIF file format’s ability to preserve transparency, you must create some transparency in your image. You’ll do that by removing the white backdrop surrounding the image map. To start this process, you’ll first convert the Background layer to a regular layer.


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