JPEG (JPG) formatJoint Photographic Experts Group (JPEG) format is a raster format commonly used to display photographs and other continuous-tone images on the World Wide Web. JPEG compresses file size by selectively discarding data. Because of this, JPEG compression is referred to as lossy. JPEG format does not support transparency. Note: Artifacts, such as wave-like patterns or blocky areas of banding, are added to a file each time you save the file as a JPEG. Always save JPEG files from the original image, not from a previously saved JPEG. A JPEG image is automatically decompressed when opened. A higher level of compression results in lower image quality; a lower level of compression results in higher image quality. In most cases, the Maximum quality option produces a result indistinguishable from the original. When you export artwork to JPEG format, the JPEG Options dialog box appears. Set the desired options, and click OK: Quality Determines the quality and size of the JPEG file. Choose an option from the Quality menu or enter a value between 0 and 10 in the Quality text box. Color Model Determines the color model of the JPEG file. Method and Scans Select Baseline ("Standard") to use a format recognized by most Web browsers, Baseline Optimized for optimized color and a slightly smaller file size, Progressive to display a series of increasingly detailed scans (you specify how many) as the image downloads. Baseline Optimized and Progressive JPEG images are not supported by all Web browsers. Depth Determines the resolution of the JPEG file. Choose Custom to specify a resolution. Anti-Alias Removes jagged edges in the artwork by supersampling it. Deselecting this option helps maintain the hard edges of line art when it is rasterized. Imagemap Generates code for image maps. If you select this option, select Client-side (.html) or Server-side (.map) to determine the type of file that is generated. Embed ICC Profiles Saves ICC profiles in the JPEG file. (See Embedding profiles in saved documents.) |