In the JPEG Options dialog box, select the options you want, and click OK.
Matte
Offers matte color choices to simulate the appearance of background transparency in images that contain transparency.
Image Options
Specifies the image quality. Choose an option from the Quality menu, drag the Quality pop-up slider, or enter a value between 0 and 12 in the Quality text box.
Format Options
Specifies the format of your JPEG file. Baseline (“Standard”) uses a format recognized by most web browsers. Baseline Optimized creates a file with optimized color and a slightly smaller file size. Progressive displays a series of increasingly detailed versions of the image (you specify how many) as it downloads. (Not all web browsers support optimized and Progressive JPEG images.)