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.

1 Make sure that the 14Start2.psd file is open in ImageReady.

2 Select the Original tab at the top of the image window.

3 Choose Fit on Screen from the Zoom Level menu in the lower left corner of the image window.

4 On the Layers palette menu, choose Layer Options. Without changing the default settings (including the name, Layer 0), click OK. The layer now appears in the Layer palette as Layer 0.

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A Background layer cannot contain any transparency information because, by definition, there is nothing behind it to be seen. If you tried to use one of the techniques that usually can replace colored pixels with transparent ones, the results would be that the original pixels would be changed to the currently selected background color instead of becoming transparent pixels.

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