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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.


compression
Techniques Glossary 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.

Compression
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.


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.

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


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; 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.

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

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.


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 ...

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.

: 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.

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 ...

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 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.

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

David De Lossy/Photodisc/Thinkstock
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JPGs are 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! ...

compression. Because lossless compression isn't practical in many cases, all popular digital cameras offer a 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" : " 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 compression format (though a lossless JPEG compression is now available). Raw formats typically use lossless compression or high quality 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 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 . 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 compression technique. A 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 - which permanently loses detail and Lossless ...

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

Photography  Lossless compression  Lossy compression

 
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