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About file formats
Graphic file formats differ in the way they represent image data (as pixels or as vectors), in compression technique, and in which Photoshop and ImageReady features they support.
For more information on choosing file formats when opening or saving images, see Opening and importing images and Saving images. For information on choosing a Web optimization format, see Optimizing images.
Note: If a supported file format does not appear in the appropriate dialog box or submenu, you may need to install the format's plug-in module. (See Using plug-in modules.)
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