The ‘multiresolution seamless image database’ widely known as MrSID, a propriety format that is commonly used for geographic information systems imagery, is also considered a lossless format. In contrast, lossless image compression techniques retain the original quality but do not compress the image as efficiently. The most common compression method, JPEG, tends to blur the appearance of lines – especially at low resolutions. In general, lossy techniques are not advised for maps as, despite their excellent compression ratios, the quality of the image is irreparably damaged. Developed primarily for pictures, there are two primary types: lossy and lossless.
Image compression applies algorithms to identify and remove information that is not critical to the perception of the image and then encode the remainder in a compact form. Peterson, in Modern Cartography Series, 2014 6.2.3 Image Compression
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