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2. Template:Non-free manual reduce - Wikipedia

   en.wikipedia.org/.../Template:Non-free_manual_reduce

   Files tagged with this template are placed in the Category:Wikipedia non-free file size reduction requests for manual processing. Once an oversized file has been replaced by a reduced version, it should be tagged with {{ subst:orphaned non-free revisions }} .

3. File:COL Chester John Hirschfelder.pdf - Wikipedia

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

   This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

4. 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 Once an oversized file has been replaced by a reduced version, it should be tagged with {{subst:orphaned non-free revisions}}.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}}

5. 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:

6. Comparison of video codecs - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_video_codecs

   The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.

7. Category : Wikipedia non-free file size reduction requests

   en.wikipedia.org/wiki/Category:Wikipedia_non...

   There are currently 15 items awaiting processing. To add a file to this category, add {{Non-free reduce}} to the file's description page. If you have fulfilled a request, please replace the tag with {{Non-free reduced|~~~~~}}. This tool can help fix these files. And this tool can help you calculate suitable non-free image dimensions.