Definition: What is a JPG?

JPG (pronounced Jay Peg) is a format used for pictures, and illustrations saved from Photoshop. Such files have a .jpg file extension. So the files are as small as possible JPG modifies the image pixel data (colour values). Some information is therefore lost in the compression procession and can never be recovered (i.e. the compression is lossy rather then lossyless).

Graphics can also be saved to JPG. For print use the resolution is normally 300dpi (dots per inch) or more. For web use the resolution is normally around 120-150 dpi. RGB colour (red green blue) is used on screens and web sites; CMYK colour (cyan magenta yellow black( is used for printing as these colours correspond to the four colour plates.

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