Joint Photographic Experts Group: supported by the ISO, the JPEG committee proposes an international standard primarily directed at continuous-tone, still-image compression. Uses DCT (Discrete Cosine Transfer) algorithm to shrink the amount of data necessary to represent digital images anywhere from 2:1 to 30:1, depending on image type. JPEG compression works by filtering out an image’s high-frequency information to reduce the volume of data and then compressing the resulting data with a compression algorithm. Low-frequency information does more to define the characteristics of an image, so losing some high frequency information doesn’t necessarily affect the image quality.
