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The amount of data held in a file determines its size. High resolution digital images can be 50 megabytes, for instance, while a text document may only be a few hundred kilobytes or less. Images can be compressed to save space, and folders of text and pictures can be grouped and reduced in size using programmes such as Stuffit, WinRAR or WinZip.

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.
The standard measurement of a digital file size. One byte is eight binary digits (bits), allowing 255 possible combinations of 1s and Os. A kilobyte (KB - not to be confused with kb [kilobit]) is 1024 bytes.
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.
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.
A data file size that comprises 1024 bytes.
A postage stamp sized copy of an image thats directly linked to the original. It has a small file size so it can be opened quickly and takes up little space on the desktop. These are often used in cataloguing programs and on Web sites.