Adobe 23101335 User Guide - Page 332
In the Modify Quality Setting dialog, requires use of the Optimized JPEG format.
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322 CHAPTER 12 Optimizing Images for the Web 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 JPEG 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 JPEG from the File Format menu. 4 Do one of the following to specify the image quality: • Choose an option from the Quality menu. • Drag the Quality pop-up slider. • Enter a value in the Quality text box. The higher the Quality setting, the more detail the compression algorithm preserves. However, using a high Quality setting results in a larger file size than using a low Quality setting. View the optimized image at several quality settings to determine the best balance of quality and file size. 5 To vary the Quality setting across the selected slices using an alpha channel, click the channel button ( ). In the Modify Quality Setting dialog box, choose an alpha channel from the pop-up menu, set a quality range, and click OK. (See "Using channels to modify JPEG quality" on page 327.) 6 To create an enhanced JPEG with a slightly smaller file size, select Optimized. The Optimized JPEG format is recommended for maximum file compression; however, some older browsers do not support this feature. 7 Select Progressive to create an image that displays progressively in a Web browser. The image will display as a series of overlays, enabling viewers to see a low-resolution version of the image before it downloads completely. The Progressive option requires use of the Optimized JPEG format. Progressive JPEGs require more RAM for viewing, and are not supported by some browsers. 8 To apply a blur to the image to smooth rough edges, enter a value for Blur or drag the pop-up slider. The Blur option applies an effect identical to that of the Gaussian Blur filter and allows the file to be compressed more, resulting in a smaller file size. A setting of 0.1 to 0.5 is recommended. 9 To preserve the ICC profile of the image with the file, select ICC Profile. ICC profiles are used by some browsers for color correction. The ICC profile option preserves ICC profiles embedded by Photoshop. This option is only available after you've saved an image with an ICC profile-it is not available for unsaved images. (See "Setting up color management" on page 124). 10 If the original image contains transparency, select a Matte color that matches the background of your Web page. (See "Making transparent and matted images" on page 339.)