EN: Compression ratio
Usually expressed as a ratio--such as 5:1 (5 to 1), it s the difference between the original quantity of data and how much is left after bandwidth compression, or the degree to which the data has been reduced numerically.
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Image files containing all the information recorded on a digital camera s sensor can be quite large. Compression results in a smaller file that contains almost all the same information. The most popular compressed formats used by cameras are .jpg or .jpeg formats. If there is a loss of information from compression, it is called lossy compression. Saving an image as a .jpg or .jpeg is a method of lossy compression, since some information is discarded. RAW files are uncompressed. Many digital cameras permit the photographer to select the degree of compression (e.g. Standard, Fine, Extra-Fine or Superfine) for an image the photographer is about to take. A Standard image will show more loss of image detail than an Extra-Fine or a Superfine image, which will show minimal detail loss.
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A Digital photograph creates an image file that is enormous. To enable image files to become smaller and more manageable cameras employ some form of compression such as JPEG. RAW and TIFF files have no compression and take up more space.
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Algorithms that discard or reorganize information to reduce file size. Compression reduces the amount of storage space and bandwidth needed for images in the digital intermediate.
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A digital process that reduces the number of bits in an image to reduce the file size. The benefit is that it takes less storage space and can be e-mailed quicker. There are two types of compression – Lossy which permanently loses detail and Lossless that returns all the data. JPEG lossy compression is the common method for digital imaging and can be adjusted to offer low compression which maintains most of the quality or higher compression which starts to affect image quality. .
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A method of reducing the size of a digital image file to free up the storage capacity of memory cards and hard drives. Compression technologies are distinguished from one another by whether or not they remove detail and color from the image. Lossless technologies compress image data without removing detail, while lossy technologies compress images by removing some detail. Joint Photographic Experts Group (JPEG) is a lossy compression format supported by JPEG, PDF and PostScript language file formats. Most video formats are also lossy formats. TIFF files are not and, as such, are far more stable than JPEGs and other lossy file formats.
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The process of reducing the bandwidth or data rate in a video or audio signal. Often used with audio and video to reduce storage and transmission costs. Compression techniques common in digital imaging rely on removing both redundant data and data that is deemed less critical or imperceptible to the viewer. This can be done either within a frame (intra-frame compression) or across multiple frames (inter-frame compression). Compression systems are developed to reduce perceptible losses, however most compression systems in use today will exhibit some level of distortion.
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The process of reducing the size of a file. Compression is either lossless or lossy .
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The state of being pressed down under a weight or squeezed together.
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Refers to reducing the quality of digital data in an effort to conserve storage space. For example, the JPEG file format is a compressed format. Certain Nikon cameras that offer RAW capture, using the Nikon Electronic File format (NEF) can .
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