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JPEG

EN: Joint Photographic Experts Group standard

Format de fișier grafic (fotografie) matricial cu un format de compresie variabil , tipic ~10:1 dar cu cât se creste raportul de compresie cu atât detaliul din imagine este estompat din cauza algoritmului de unire a pixelilor asemănători aflați în vecinătate.

[Nota editorului]Dimensiunea maxima este de 4294 Megapixeli, 66635×65535 pixeli

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Joint Photographic Experts Group. This is the name of the committee that designed the standard image compression algorithm. JPEG was designed for compressing full colour or grey scale digital images of natural scenes. It doesn’t work so well with non-realistic images, such as cartoons however. JPEG does not handle the compression of black and white (1 bit-per-pixel) images or moving pictures.

allthingsphotography
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– The Joint Photographic Experts Group file format is the most popular for storing digital images from a camera. To speed up operations, as well as save storage space, JPEG images are compressed; the degree of compression determines the quality of the image. JPEG image quality is not as good as when the image data is saved without compression (RAW). However, the RAW file format requires more storage space, takes longer to capture and process, and is not standard (each camera manufacturer has its own version).

Tom`s Guide
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Abbreviation of Joint Photographic Experts Group, the name of the committee that created a standard for still image compression.

dxoglossary
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Short for Joint Photographic Experts Group. A lossy digital image file compression system, data is removed to create a smaller file size than if the file contained all the raw data.

Canon glossary
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A standard for compressing image data developed by the Joint Photographic Experts Group.

nikongrossary
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Joint Photographic Experts Group that describes an image file format standard in which the size of the file is reduced by compressing it. JPEG, with its 16.7 million colors, is well suited to compressing photographic images. A JPEG image file name carries the extension jpg - e.g. portrait.jpg Many people refer to an image in JPEG format as a JPEG, pronounced jay-peg .) Most digital cameras save images as JPEG files, and some high-end cameras can be set to record both JPEG and RAW image files at the same time. Note: When working on an image in an image-editing program, you can avoid data loss due to compression when saving and re-saving the file by first saving the .jpg image as a .TIFF image, which is not compressed when saved.

Photo Tips
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The new JPEG compression standard that may start to be used in digital cameras and software. It will feature higher compression with less image quality loss.

allthingsphotography
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Standard method of image data compression used to reduce the file size of digital images. It s known as lossy compression because there is a permanent loss of some data during the process.

ePhotozine
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The de facto standard for image compression in digital imaging devices. JPEG is a lossy compression format, capable of reducing a digital image file to about 5% of its normal size. The resulting decompression of the file can cause blockiness, jaggies, or pixelization in certain digital images. The greater the compression levels, the more of a chance pixelization or blockiness will occur. The greater the pixel count, the less of a chance pixelization will occur.

bhphotovideo
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Totally different from the original JPEG image coding system (DCT-based, examines images in a series of 8 x 8 pixel blocks), JPEG 2000 is wavelet-based, analyzing pictures in circular areas. Its coding and decoding require far more processing than MPEG-2 and MPEG-4, and is intra-frame only, with no predictive frames.

Canon glossary
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Fisier de imagine JPEG salvat la cele mai mici dimensiuni, dar care nu este recunoscut de toate browser-ele de Internet.

Foto Magazine
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Format de imagine care este afisata pe site-uri dupa descarcarea completa. Este recunoscuta de marea majoritate a browser-elor WEB.

Foto Magazine
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Metoda de salvare a imaginilor JPEG care, in browser, apare initial la rezolutie mica, si care se imbunatateste progresiv, in 3 - 5 pasi.

Foto Magazine
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The most commonly used computer image format used to store photographs.

visualartcork