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Photography  Lossless compression  Lossy compression

Lossy Formats
We are basically talking about jpg here. It is also possible for TIFF to be "lossy", if you use the compression algorithms when you save to TIFF.


Lossy compression
Techniques Glossary Lossy compression
Where pixels are removed (lost) to make the file size of a digital image smaller. When compressing images using the JPEG format you have the option of varying the level of compression.

Lossy audio formats
Lossy audio formats offer drastically reduced file sizes at the cost of compromised audio quality.

Lossy Compression
Lossy compression reduces the image size by discarding information and is similar to summarizing a document.

Lossy
Lossy (file format) refers to a characteristic of the file compression.

Lossy
denotes a loss of data during Image file compression. Only occurs when higher compression rates are used.
Lossless ...

LOSSY or Lossy compression - A form of image compression when saving an image that discards (loses) data from it. Saving a picture as a .jpg or .jpeg is a method of lossy compression.

LOSSY - A form of image compression when saving the image that discards data from it. Saving a picture as a JPEG uses lossy compression.

Lossy/Lossless files
When a digital camera takes a photo, the image data is stored on a memory card as a computer file. If the data is stored fully, the file is called a lossless file. These files are quite large in size.

Lossy
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.

Lossy. See Compression, lossy.
LZW. A compression scheme used to reduce the size of image files.
Macro mode. A lens mode that allows you to get very close to objects so they appear greatly enlarged in the picture.

Lossy compression
A method of reducing image file size by throwing away unneeded data, causing a slight degradation of image quality. JPEG is a lossy compression method.

Lossy:
A form of compression that discards and compromises on the quality of data stored.
The JPEG file format is an example of lossy compression.

Lossy compression - A type of file compression that results in the loss of image data every time the image is saved. JPEG is a lossy file format.

Lossy
An image format that sacrifices a certain amount of image information in order to create a smaller compressed file.
LZW ...

lossy encoding
A data compression or encoding algorithm that loses, or purposely throws away, input data during the encoding process to gain a better compression ratio. JPEG is an example of a lossy encoding method.
LPI ...

Lossy Compression
Software algorithms (and accompanying file formats) used for reducing files sizes were data (often targeting redundant data) is discarded during compression and is not fully restored when decompressed.

lossy compression
A compression algorithm that reduces file size by actually removing imformation from the image, audio or video signal.

Lossy: In order to achieve very significant quantities of file size reduction, information contained within the original file is discarded, resulting in a degradation of the image quality. This cannot be fully recovered (reconstructed) later.

Lossy compression. An image-compression scheme, such as JPEG, that creates smaller files by discarding image information, which can affect image quality. See also compression.

Lossy compression
A method of image compression where some image quality is sacrificed in exchange for higher compression ratios. The amount of quality degradation depends on the compression algorithm used and a user selected quality variable.

Lossy
A data compression technique that can reduce the detail of a digital image file. Most video compression techniques utilize lossy compression.
Low-Pass Filter ...

Lossy compression - used by a file format such as JPEG - can create smaller files but in doing so throws away some of the original image data. The more compressed an image is with a lossy method the more degraded it becomes.

Lossy
The RAW file format uses a lossless compression, and so it does not suffer from the compression artifacts visible with "lossy" JPEG compression.

Lossy: Data compression techniques that reduce some detail of a digital image are described as being "lossy." Most digital photo and video compression techniques utilize lossy compression.

David De Lossy/Photodisc/Thinkstock
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JPGs are lossy compression. They throw away data very cleverly so it's not visible. They can save a lot more space than lossless compression. JPGs easily can throw away 90% of the file size and still look perfect! ...

I hate lossy compression. Keep your image quality settings high to avoid shots like that one. You might see this and think - Well, DUH! ...

Lossy compression. Because lossless compression isn't practical in many cases, all popular digital cameras offer a lossy compression (rhymes with "bossy").

GIF
Another lossy compression format, GIF is commonly used for logos and clip-art type images - not usually for photos.
Pros - Small files sizes, widely accepted
Cons - Not meant for photos, compression format not overly efficient ...

html" } , { "Title" : "Lossy Compression" ,"GlossaryIcon" : "" ,"HideInGlossary" : "" ,"Summary" : "A reduction of image file size by disposing of unneeded data, resulting in a slight degradation of image quality.

'Lossless' techniques compress image data without removing detail; 'lossy' techniques compress images by removing detail. Compression, lossless A file compression scheme that makes a file smaller without degrading the image.

JPEG images are typically saved using a lossy compression format (though a lossless JPEG compression is now available). Raw formats typically use lossless compression or high quality lossy compression.
Finer control.

There is a gnawing fear that somehow because JPEG is a "lossy" compression algorithm you'll be throwing away that vital pixel.

It produces high quality video at small file sizes and uses lossy intraframe compression.
AVI (Audio Video Interleave) developed by Microsoft, is a popular format for audio/video data on the computer but it is of relatively low quality.

These files are compressed, but in a non-lossy manner. They are significantly smaller than equivalent TIFF files, but larger than JPEGs.

There are two general types of data compression: lossless and lossy. Lossless compression has the advantage that no data is lost. So, lossless compression does not degrade the quality of images.

The most important thing to keep in mind is that JPEG is a lossy compression algorithm, meaning that every time you save a JPEG, you are losing information in the process of compressing it.

However JPEG uses a lossy compression technique. A lossy compression technique reduces file size by discarding unneeded data, resulting in a slight degradation of image quality each time the file is saved and reopened.

There are two types of compression: lossy and lossless. Lossy compression (JPEG is an example) can result in visible degradation of image quality, especially when saving the same image as a JPEG multiple times, ...

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 ...

The JPEG process is a 'lossy' one, meaning that some data is removed, and color gradients are simplified, which may result in some image degradation based on the amount of compression you choose.

In computing, JPEG is a commonly used method of lossy compression for digital photography (image).

This includes various NR (DFS and dark current), lossy compression (in the case of the compressed NEF format), loss-less compression (Canon TIF/CRW/CR2 formats), ...

PSD is the format Photoshop Elements and Photoshop CS uses for non-lossy storage. That is, no matter how many times you open, edit and save your image, it won't lose any quality.
David.
Harris says: ...

JPEG is great for general photographic use. Used by all digital cameras, JPEG is a lossy format, which means it sacrifices some quality to ensure minimal small file size.
The advantages of using JPEG: ...

Acronym for Joint Photographic Experts Group, and pronounced jay-peg. JPEG is a lossy compression technique for color images. Although it can reduce files sizes to about 5% of their normal size, some detail is lost in the compression.

It compresses the image in a lossy fashion, which means it discards picture information that people are unlikely to notice.

JPG - The most common type of compressed image file format used in digicams. It is a "lossy" type of storage because even in its highest quality mode there is compression used to minimize its size.

Joint Photographic Experts Group. A common method of image compression. JPEG compression is said to be 'lossy', detail is permanently lost each time the image is edited and saved.
Mb
Megabytes.

In general, JPEG transformations are not reversible. Opening and then saving a JPEG file causes a new, lossy compression. Increasing the quality factor later will not bring back the image information which was lost.
L*a*b ...

It is referred to as a lossy format, which means some quality is lost in achieving JPEG's high compression rates.

An acronym fot the Joint Photographic Experts Group and is a standard for compressing image data. A JPEG is not a true file format, but is a compression method used within a file format. Sometimes referred to as a 'lossy' format because some image ...

By eliminating very subtle color distinctions that the human eye usually cannot detect, JPEG images are compressed so that they can save faster and use less space. Because JPEG format actually alters an image, it's compression is said to be "lossy, ...

When discrepancies occur between the original and the reconstructed image, the compression is called lossy. Lossless compressions can be achieved with compression ratios of up to 5 to 1.

See also: See also: Image, Digital, Camera, Photograph, Compression

Photography  Lossless compression  Lossy compression

 
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