A typical font may contain hundreds or even thousands of glyphs, often representing characters from many different languages. Oftentimes, users may only need a small subset of the glyphs that are available to them. Subsetting is the process of removing unnecessary glyphs from a font file, usually with the goal of reducing file size. This is particularly important for web fonts, since reducing file size often means reducing page load time. Besides reducing file size, subsetting can also be used for other purposes. For example, Fontslice LLC recently began subsetting fonts as a means of reducing the average transaction cost of font licensing.
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Subsetting is a concept used in research communities (for example, earth sciences) to describe the process of retrieving just the parts of large files which are of interest for a specific purpose. This occurs usually in a client—server setting, where the extraction of the parts of interest occurs on the server before the data is sent to the client over a network. The main purpose of subsetting is to save bandwidth on the network and storage space on the client computer.
... Range subsetting (not to be mixed up with the (domain) subsetting of the WCS Core) allows to extract components from structured cells ("pixels", "voxels") of a coverage ... For example, from a 7-band Landsat satellite image a range subsetting request may extract the near-infrared, red, and green range components ("bands", "channels") ...