LYCOS RETRIEVER 
File Format: Images
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The JPEG or JPG file format was adopted quite early on the Internet. It's name comes from Joint Photographic Experts Group, the organization that created the format. As evident from the name, JPEG images are used mainly for photographs.
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Each file format has its own place in the workflow for which it was developed. This could be a specific task such as word processing, layout, image capture, retouching, etc. Choosing the ideal format is easier if you understand the value-added features of each.
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[One] major difference between most other image file formats and TIFF, is that TIFF allows for a wide range of different compression schemes and color spaces. These are specified in dedicated tags. Where other file formats are often designed to suit a single compression method, TIFF allows for JPEG or JBIG compression, the infamous LZW or the free-as-a-bird deflate compression, amongst many others. The same goes for color spaces. Theoretically, you could even use any compression method and color space of your own, though it goes without saying this would result in crippled portability.
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In uncompressed BMP files, and many other bitmap file formats, image pixels are stored with a color depth of 1, 4, 8, 16, 24, or 32 bits per pixel. Images of 8 bits and fewer can be either grayscale or indexed color. An alpha channel (for transparency) may be stored in a separate file, where it is similar to a grayscale image, or in a fourth channel that converts 24-bit images to 32 bits per pixel.
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As you learn and become more familiar with Adobe Photoshop you will likely notice that Photoshop allows you to save images in many different formats or file types. Having a working knowledge and understanding of these different image formats is essential to making the most of your digital photo projects. While they are many different image types the following is a description of the most common file types you will use when working in Photoshop.
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This is a list of links to information on file formats for perceivable or renderable content, e.g., sounds, images, text, movies, etc. File formats for compression, encoding or encryption aren't included here.
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