Adobe 23101335 User Guide - Page 333
Setting optimization options for GIF and, PNG-8 formats, You cannot use the Lossy option with
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ADOBE PHOTOSHOP 6.0 323 User Guide Setting optimization options for GIF and PNG-8 formats GIF is the standard format for compressing images with flat color and crisp detail, such as line art, logos, or illustrations with type. (See "About GIF format" on page 319.) Like the GIF format, PNG-8 efficiently compresses solid areas of color while preserving sharp detail; however, not all Web browsers can display PNG-8 files. (See "About PNG-8 format" on page 319.) A B C ImageReady Optimize palette GIF options, with hidden options shown: A. File Format menu B. Color Reduction Algorithm menu C. Dither Algorithm menu In ImageReady, you can control which options show in the Optimize palette by clicking the Show Options control ( ) on the Optimize palette tab. To show all options, choose Show Options from the Optimize palette menu. To optimize an image in GIF or PNG-8 format: 1 Select a view in which to apply the optimization setting. 2 Select the slice or slices to which you want to apply the optimization setting. (See "Selecting slices" on page 276.) 3 In the Optimize panel/palette, choose GIF or PNG-8 from the File Format menu. 4 For GIF format only: Drag the Lossy slider or enter a value to allow for lossy compression. Lossy compression reduces file size by selectively discarding data-a higher Lossy setting results in more data being discarded. You can often apply a Lossy value of 5-10, and sometimes up to 50, without degrading the image. File size can often be reduced 5%-40% using the Lossy option. Note: You cannot use the Lossy option with the Interlaced option, or with Noise or Pattern Dither algorithms. 5 For GIF format only: To vary the Lossy setting across the selected slices using an alpha channel, click the channel button ( ) next to the Lossy text box. In the Modify Lossiness Setting dialog box, choose an alpha channel from the pop-up menu, set a lossiness range, and click OK. (See "Using channels to modify GIF lossiness" on page 328.) 6 Select a color reduction algorithm. (See "Generating a color table" on page 330.)