Adobe 23101335 User Guide - Page 354
Creating and applying custom dither, patterns, Choose Filter > Other > DitherBox.
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344 CHAPTER 12 Optimizing Images for the Web Creating and applying custom dither patterns You can use the DitherBox filter to create a custom dither pattern for a selected RGB color. You can then fill a selection or a layer in an image with the dither pattern. You can save custom dither patterns in groups called collections, and use the dither patterns with other images. To create and apply a custom dither pattern: 1 With an image displayed in the document window (Photoshop) or in Original view (ImageReady), use the eyedropper tool ( ) to select a foreground color that you want to simulate with a customized dither pattern. (The foreground color becomes the basis for the custom dither pattern in DitherBox.) Note: In Photoshop, you create custom dither patterns while in the main Photoshop work area (not in the Save for Web dialog box). Make sure the image is in RGB color mode. See Photoshop online Help for information on color modes. 2 Use the selection tools or the Layers palette to select an area or a layer in the image that you want to fill with the custom dither pattern. 3 Choose Filter > Other > DitherBox. The RGB swatch in the DitherBox dialog box displays the current foreground color. To choose another RGB color on which to base the dither pattern, click the RGB swatch, select a new color in the color picker, and then press the arrow button ( ) to transfer it to the pattern box. 4 Choose one of the following from the color palette pop-up menu in the DitherBox dialog box: • Web Safe Colors to create a dither pattern using colors from the Web palette. • Load to load another color palette and create a dither pattern using those colors. Then navigate to the color palette and open it. Note: If you use non-Web palette colors in a custom dither pattern, the colors will dither in a browser using an 8-bit color display. Using non-Web colors is recommended only for non-Web display. By default, a new dither pattern you create is saved in the current dither pattern collection. 5 Select a pixel pattern for the custom dither pattern from the pattern list, between 2 and 8 pixels square. 6 Click the arrow button ( ) to display the dither pattern that most closely matches the selected RGB color in the Pattern preview box. If no dither patterns are currently saved in a collection in the DitherBox filter, the Pattern preview box displays the dither pattern that matches the RGB color. Dither pattern