To use masks to modify dithering:

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 Click the mask button J to the right of the Dither text box.

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

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

5 Define the dithering range:

• To set the highest percentage of dithering, drag the right (white) tab on the slider, enter a value in the Maximum text box, or use the arrows to change the current percentage.

• To set the lowest percentage of dithering, drag the left (black) tab on the slider, enter a value in the Minimum text box, or use the arrows to change the current percentage.

6 Click OK.

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