A method of file compression that removes redundant pixels in an image, thus altering the original image to some degree. In most cases the difference is not distinguishable. Lossy data compression can reduce a file to 1/50th of its original size.
A compression scheme that lowers clip size by discarding nonessential data from the source file. Both RealAudio and RealVideo are lossy.
A term to describe compression techniques that throw away data as part of the process. The more data "loss", the smaller the file, and the lower the quality (grainy or jagged edged) image. Lossy compression methods include JPEG and MPEG. Note: with JPEG, "high" means high compression (greater loss) and "low" means low compression (less loss).
Lossy file compression results in lost data and quality from the original ...
Losing data, usually in a compression or conversion of some kind. ( cp. lossless)
compression in which information is lost. Saving a file repeatedly with lossy compression will additionally degrade the image quality. This degradation is known as "generation loss". Cinepak is a lossy codec. Go back to the top of the page
Describes an image compression that results in loss of quality.
compression method (e.g. JPEG)
Any compression scheme, especially for audio and video data, that removes some of the original information in order to significantly reduce the size of the compressed data. Lossy image and audio compression schemes such as JPEG and MP3 try to eliminate information in subtle ways so that the change is barely perceptible, and sound or video quality is not seriously degraded.
Image compression that functions by removing minor tonal and/or color variations, causing visible loss of detail at high compression ratios.
The opposite of lossless data compression, this is a codec that loses some of the original data in the process of compressing the file. Purveyors of lossy codecs - like MP3s, WMAs, and AACs - attest that the data lost is not audible data anyway, at least to most listeners' ears. Lossy codecs were derived to deliver the closest possible reproduction of an original track in a much much smaller package.
In the context of image compression, this refers to the loss of data when compressing an image. Uncompressing the image will not give a replica of the original. JPG images use lossy compression.
A method of compressing images which results in a slight reduction of image quality.
Compression formats such as MP3 are classed as lossy. This means the compression system removes certain frequencies from the original signal which can lead to an audible loss of sound quality.
A data compression scheme that excludes or removes information it regards as unnecessary from the original, uncompressed file. The Joint Photographic Experts Group format, JPEG or JPG, uses a lossy compression scheme.
a data lossy compression method is one where compressing data and then decompressing it retrieves data that may well be different from the original, but is "close enough" to be useful in some way. This type of compression is used frequently on the Internet and especially in streaming media and telephony applications. These methods are typically referred to as codecs in this context. [more...
Some information lost. Term used to describe compression formats. The file characteristics discarded tend to be things the human eye will not notice, e.g., shades of color, rather than those visible to the human eye, e.g., brightness.
A way of compressing by throwing data away; this results in much smaller file sizes than with lossless compression, but at the expense of some artefacts. Many experts believe that up to 95 percent of the data in a typical image may be discarded without a noticeable loss in apparent resolution.
A compression format that sacrifices a certain amount of information in order to create a smaller compressed file.
Refers to a data compression algorithm that actually reduces the amount of information in the data, rather than just the number of bits used to represent that information. The lost information is usually removed because it is subjectively less important to the quality of the data (usually an image or sound) or because it can be recovered reasonably by interpolation from the remaining data.
Many file formats use compression to reduce the file size of bitmap images (digital photo). Lossless techniques compress the file without removing image detail or colour information; lossy techniques remove detail. JPEG is the most common file format in digital photography but this is a "Lossy" file format. TIFF with LZW(Lemple-Zif-Welch) compression is the most popular lossless file format. (see JPEG & TIFF)
Image compression that functions by removing minor tonal and/or color variations, causing a slight loss of detail.
A compression scheme where some of the less important or less visible data is discarded in order to make the image smaller. The reconstructed image is close to the original, but not exactly the same.
A lossy compression system achieves a saving in file size by altering the data in the file in ways which have little effect on perception, but a disproportionate decrease in file size. The file will appear the same as before the compression, but the information in the file will have been changed.
Characteristic of data compression algorithms in which compressed data may not decompress exactly to its original form. Lossy compression is typically capable of very high compression performance, and is used primarily on data which may be slightly changed without significant effect.
Data compression techniques that reduce some detail of a digital image are described as being "lossy." Most video compression techniques utilize lossy compression.
Fairly self-explanatory, lossy/lossless describes the character of a compression algorithm. Lossless algorithms concentrate on how to compact data without losing any information. Lossy algorithms concentrate on how to remove data that is less critical to human perception.
Used to denote a form of compression that degrades the quality of the image being compressed.
A lossy compression allows for the quality of the compressed data to be diminished after decompression. It is suitable for audio, video and image compression.
A term coined by graphics programmers to refer to a technique of shrinking file sizes by giving away some precision of detail. JPEG is the most common of these. By reducing the so-called quality of a picture when you save it, you can make the file size smaller. Many pictures can take a lot of loss of fine detail before it becomes noticeable on a web page. See the explanation in Creating Small, Fast-Loading Graphics for Web Pages.
Refers to data compression techniques in which some amount of data is sacrificed in the name of file size reduction. Lossy compression technologies attempt to eliminate redundant or unnecessary information. Examples of lossy compression formats are the photo JPEG format, audio Dolby Digital format and video MPEG formats.
A type of file compression in which audio data is thrown away, or lost, as a way of shrinking file size. MP3, for instance, is a lossy format, but, like other lossy formats, tries very hard to discard only data that is not usually heard.
Some information from the raw image is lost in an effort to minimize file size. JPEG is one lossy compression scheme.
A slightly degenerative compression method, in which relatively unimportant data is selectively discarded, after which the rest of the image is compressed.
Describes an image-compression method that reduces image detail in order to create a smaller file size.
Refers to a compression scheme such as duplication which causes signal fidelity to degrade. Lossy compression can compress to any level, but the more compression is used, the more quality is sacrificed.
A video/image compression method that doesn't preserve 100% of the information in the original data.
In lossy compression, some pieces of information are permanently lost during compression. JPEGs use lossy compression.
A lossy compression algorithm (as opposed to a lossless algorithm) achieves its space savings by sacrificing the least critical portions of data. A lossy compression algorithm is not fully revisible, and uncompression will not result in an exact copy of the original data. [ edit
Refers to data compression techniques in which some amount of data is lost. Lossy technologies attempt to eliminate redundant information without losing quality. Used by most video compression technologies.
Scanners. Data compression algorithms that assumes some of the data in an image file is unnecessary and can be eliminated without affecting the perceived image quality. Typically this type of compression has ratios between 10:1 and 100:1.
A form of data compression where detail is removed as the file size are reduced. A common lossy compression method is JPEG.
Data compression algorithms that assume some of the data in a image file is unnecessary and can be eliminated without affecting the perceived image quality. It is suitable for audio, video and image compression.
Methods of image compression, such as JPEG, that reduce the size of an image by eliminating some pictorial information. Lossy methods result in some image degradation which is usually a factor of the degree of compression. The greater the compression ratio (more information removed), the more image degradation.