COMPRESSION RATIO- Compression is a function of the camera's internal programming to take a picture and store in less space than it would normally fill.
Compression Ratio
The amount of data in a digital image divided by the amount of data in a version after compression. Higher ratios indicate more compression which may degrade image quality.
(see JPEG and Lossy) ...
[edit] Compression ratio and artifacts
This image shows the (accentuated) difference between a jpg-saved image and the original. Note especially the changes occurring near sharp edges.
The technique used in JPEG compression allows the user to select the compression ratio. High-compression ratios generally result in low image quality.
If your camera lets you choose a file format and compression ratio you should always choose those that give you the highest quality.
At higher compression ratios, the block pattern becomes more visible and there may be noticeable loss of detail. The actual effect depends on the size of the image when output on a monitor or printer and on the type of subject.
Once inside the “Save for Web' area, we can really work on the file size and compression ratio. An image size of 50k will hold the detail and also make a nice small size when e-mailing or putting the photo online for Web viewing.
The typical compression ratio of compressed lossless audio files is 2:1, so you can reduce a file size by half and still retain lossless audio quality.
You decide the final format, compression ratios, sizes, color balances, etc. In RAW mode, you have the absolute best image your camera can produce. It is unoptimized, and ready for your personal touch. No camera processing allowed! ...
JPEG has a standard compression ratio of 10:1 without any visible loss of image quality.
A file format using wavelet based image compression which offers high compression ratios without the image degradation associated with standard JPEG compression.
keyword searches ...
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 ...
The digital video compression standard agreed upon by the Motion Picture Expert Group, from the motion picture-computer industry. MPEG-2 is used by most camcorders and MPEG-4 with a higher compression ratio is popular with digital cameras that offer ...
Most photographers will tell you to shoot as large as you can and own more medial cards. Too much compression of the files can cause the "jaggies", or "pixelization" in some digital images. The higher the compression ratio the more the pixelization ...
Up to three parameter sets: tone (gamma) curve, sharpening, JPEG compression ratio
Selectable 'colour matrix' settings define colour space (sRGB / Adobe RGB) and balance ...
 See also: Compression, Image, JPEG, Photograph, Digital
  
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