Joint Photographic Experts Group

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Joint Photographic Experts Group
The Joint Photographic Experts Group is a joint committee between ISO and ITU-T (formerly CCITT) which created the JPEG and JPEG 2000 standards. Its proper name is ISO/IEC Joint Technical Committee 1, Subcommittee 29, Working Group 1.The group was formed in 1982, and meet three times annually in North America, Asia and Europe.
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Joint Photographic Experts Group
JPEG (extension informatique .JPG) est un acronyme de Joint Photographic Experts Group, nom d'un groupe de travail en partenariat ISO et CEI (d'où le joint pour mixte). Créé dès 1986, il rassemble des professionnels de l'industrie de l'image (TV, fax-télécoms, informatique). Cette initiative faisait suite à des demandes d'améliorations pour le facsimilé, qui donnera également la norme ISO/CEI JBIG (Joint Binary-level Image Group). Ce comité a donné son nom à la norme ouverte de compression d'images numériques JPEG. Ensuite cette norme a donné son nom au format de données défini et au format de fichier le plus utilisé pour contenir ces données.
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Joint Photographic Experts Group
Die Joint Photographic Experts Group [] (engl. Verbindung der Fotografieexperten) ist ein gemeinsames Komitee der ISO und der ITU-T (früher CCITT), das die JPEG- und JPEG 2000-Standards entwickelt hat. Ihr genauer Name ist ISO/IEC Joint Technical Committee 1, Subcommittee 29, Working Group 1.Die Gruppe wurde 1982 gegründet und trifft sich dreimal pro Jahr: jeweils einmal in Nordamerika, Asien und Europa.
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JPEG
JPEG (wym. dżej-peg lub jot-peg) – standard kompresji statycznych obrazów rastrowych, przeznaczony głównie do przetwarzania obrazów naturalnych (zdjęć satelitarnych, pejzażyportretów itp.), charakteryzujących się płynnymi przejściami barw oraz brakiem lub małą ilością ostrych krawędzi i drobnych detali.
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Joint Photographic Experts Group
JPEG è l'acronimo di Joint Photographic Experts Group, un comitato ISO/CCITT che ha definito il primo standard internazionale di compressione per immagini a tono continuo, sia a livelli di grigio che a colori.Attualmente JPEG è lo standard di compressione delle immagini fotografiche più utilizzato. Le estensioni più comuni per questo formato sono .jpeg, .jpg, .jfif, .JPG, .JPE, anche se il più comune in tutte le piattaforme è .jpg.JPEG specifica solamente come una immagine può essere trasformata in uno stream di byte, ma non come questo può essere incapsulato in supporti di memorizzazione. Un ulteriore standard chiamato JFIF (JPEG File Interchange Format), creato da Independent JPEG Group, specifica come produrre un file appropriato per la memorizzazione su computer di uno stream JPEG. Nell'uso comune, quando qualcuno parla di "file JPEG" generalmente intende un file JFIF o alcune volte un file Exif JPEG. Ci sono, comunque, altri formati di file basati su JPEG, come ad esempio JNG.
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