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Compression

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A digital process that reduces the number of bits in an image to reduce the file size. The benefit is that it takes less storage space and can be e-mailed quicker. There are two types of compression – Lossy which permanently loses detail and Lossless that returns all the data. JPEG lossy compression is the common method for digital imaging and can be adjusted to offer low compression which maintains most of the quality or higher compression which starts to affect image quality.

Related Terms

Where pixels are removed (lost) to make the file size of a digital image smaller. When compressing images using the JPEG format you have the option of varying the level of compression. A higher level makes the file size much smaller but removes more pixels.
Standard method of image data compression used to reduce the file size of digital images. It's known as lossy compression because there is a permanent loss of some data during the process.
Irregular flaws in image colour or sharpness caused by CCD problems, noise or compression.
A lossless form of compression used to create TIFF files.
A lossless compression file format thats ideal for digital photography.