To use masks to modify color reduction:

1 In the Optimize panel/palette, choose a GIF or PNG-8 setting from the Settings menu, or choose GIF or PNG-8 from the file format menu.

2 Choose a color reduction algorithm and specify the maximum number of colors.

3 Click the mask button J to the right of the Color Reduction Algorithm pop-up menu.

4 Choose which masks to use:

• All Text Layers to use the masks from all text layers in the image.

• All Vector Shape Layers to use the masks from all shape layers in the image.

• Channel to choose an alpha channel from the menu. In ImageReady, you can choose Save Selection to create a new alpha channel based on the current selection.

5 To preview the results of the weighted optimization, select the Preview option.

6 Click OK.

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Photoshop Secrets

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