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.

Understanding Adobe Photoshop Features You Will Use

Understanding Adobe Photoshop Features You Will Use

Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.

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