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2. File:US passport high resolution.jpg - Wikipedia

   en.wikipedia.org/wiki/File:US_passport_high...

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3. Image compression - Wikipedia

   en.wikipedia.org/wiki/Image_compression

   Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.

4. Wikipedia : Featured picture criteria/Image size

   en.wikipedia.org/.../Image_size

   Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.

5. Template:Non-free reduce - Wikipedia

   en.wikipedia.org/wiki/Template:Non-free_reduce

   This template should be added to the oversized file. Files tagged with this template are placed in the Category:Wikipedia non-free file size reduction requests. Once an oversized file has been replaced by a reduced version, it should be tagged with {{subst:orphaned non-free revisions}}. For non-free audio-file, add {{Non-free reduce|type=audio}}

6. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:

7. File:US Passport Card Back Revised.jpg - Wikipedia

   en.wikipedia.org/wiki/File:US_Passport_Card_Back...

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8. Quantization (image processing) - Wikipedia

   en.wikipedia.org/wiki/Quantization_(image...

   When the number of discrete symbols in a given stream is reduced, the stream becomes more compressible. For example, reducing the number of colors required to represent a digital image makes it possible to reduce its file size. Specific applications include DCT data quantization in JPEG and DWT data quantization in JPEG 2000.

9. File:Passport card.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Passport_card.jpg

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