lossless - definizione. Che cos'è lossless
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Cosa (chi) è lossless - definizione

DATA COMPRESSION APPROACH ALLOWING PERFECT RECONSTRUCTION OF THE ORIGINAL DATA
Data compression/lossless; Lossless; Lossless encoding; Lossless encoder; Lossless codec; Losslessly; Loseless; Magic compression algorithm; Maximum Compression Benchmark; Calgary Challenge; Lossless compression benchmarks; Lossless data compression; Lossless format; Reversible compression; General purpose lossless compression methods; Lossless 3D compression; 🆩; Generic Compression Benchmark; Lossless Video Compression; List of lossless compression methods; Benchmarks for lossless compression

lossless         
<algorithm, compression> A term describing a data compression algorithm which retains all the information in the data, allowing it to be recovered perfectly by decompression. Unix compress and GNU gzip perform lossless compression. Opposite: lossy. (1995-03-29)
Lossless         
·adj Free from loss.
lossless         
¦ adjective
1. without dissipation of electrical or electromagnetic energy.
2. Computing (of data compression) without loss of information.

Wikipedia

Lossless compression

Lossless compression is a class of data compression that allows the original data to be perfectly reconstructed from the compressed data with no loss of information. Lossless compression is possible because most real-world data exhibits statistical redundancy. By contrast, lossy compression permits reconstruction only of an approximation of the original data, though usually with greatly improved compression rates (and therefore reduced media sizes).

By operation of the pigeonhole principle, no lossless compression algorithm can efficiently compress all possible data. For this reason, many different algorithms exist that are designed either with a specific type of input data in mind or with specific assumptions about what kinds of redundancy the uncompressed data are likely to contain. Therefore, compression ratios tend to be stronger on human- and machine-readable documents and code in comparison to entropic binary data (random bytes).

Lossless data compression is used in many applications. For example, it is used in the ZIP file format and in the GNU tool gzip. It is also often used as a component within lossy data compression technologies (e.g. lossless mid/side joint stereo preprocessing by MP3 encoders and other lossy audio encoders).

Lossless compression is used in cases where it is important that the original and the decompressed data be identical, or where deviations from the original data would be unfavourable. Typical examples are executable programs, text documents, and source code. Some image file formats, like PNG or GIF, use only lossless compression, while others like TIFF and MNG may use either lossless or lossy methods. Lossless audio formats are most often used for archiving or production purposes, while smaller lossy audio files are typically used on portable players and in other cases where storage space is limited or exact replication of the audio is unnecessary.

Esempi dal corpus di testo per lossless
1. Sonos will also stream compressed (but not lossless) WMA files and non–copy–protected AAC files.
2. The iPhone 3G does an admirable job supporting MP3, AAC, Audible, Apple Lossless, WAV, and AIFF audio files, as well as MPEG–4 or H.264 video files.
3. When Thiagarajan first applied this compression technique on the images from a hospital in Singapore, he could achieve 35 times lossless compression.
4. With simple repetition coding, the new technology, Adaptive Binary Optimisation (ABO), will achieve not only ‘lossless’ compression but also more compression.
5. Features The Sonos Digital Music System can stream a wide range of file formats: MP3, Ogg Vorbis, FLAC, Apple Lossless, WAV, and AIFF files are compatible, as are Audible audio books.