product delivers better sound quality than MP3 for same-size files, as well as near-DVD-quality video. Windows Media Technology: This Microsoft Corp. Wavelet: This form of lossy compression uses a mathematical function that can compress images to a greater extent than other methods - sometimes to only one-fourth the size of a similar image compressed with JPEG. PKUnzip decompresses the files to their original states. The program uses an algorithm and a data library to encode or archive multiple date files. PKZip: A popular lossless compression shareware program from PKWare Inc. MPEG Audio Layer 3 (MP3): An audio compression technology that's part of MPEG-1 that uses perceptual audio coding to compress CD-quality audio by a factor of 12.įractal: A lossy compression method for color images that's well suited for natural objects, with compression ratios up to 100-to-1.
MPEG-2 compresses video for regular and high-definition television. MPEG-1 is used for CD-ROMs and video CDs. Moving Pictures Experts Group (MPEG): A lossy compression method for video. Lookup entries are part of the compressed file, enabling the decoding program to rebuild the table. Lempel-Ziv-Welch: This algorithm, used in many compression formats, including graphics interchange format and Tag Image File Format, takes each input sequence of bits of a given length and creates an entry in a lookup table, along with a shorter code. Joint Photographic Experts Group (JPEG): A still-image, lossy compression method that uses discrete cosine transform equations to compress images at a ratio of up to 20-to-1, without noticeable loss.
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