Creating JPEGs
Because JPEG is a standard file format, it is supported by all the popular graphics tools. Adobe Photoshop/ImageReady, JASC Paint Shop Pro, and Macromedia Fireworks all provide similar options for saving JPEGs. All of these products allow you to set the quality/compression level and save images in Progressive JPEG format .
Make sure your file is in RGB or grayscale format. You can apply JPEG compression to CMYK files in some applications, but these files are not compatible with web browsers. Be sure to name your file with the suffix .jpg or .jpeg. This is necessary for the browser to recognize it as a readable JPEG file type.
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