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2. Wikipedia:Featured picture criteria/Image size - Wikipedia

   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.

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. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   An image file format is a file format for a digital image. There are many formats that can be used, such as JPEG, PNG, and GIF. Most formats up until 2022 were for storing 2D images, not 3D ones. The data stored in an image file format may be compressed or uncompressed. If the data is compressed, it may be done so using lossy compression or ...

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. Wikipedia talk:Preparing images for upload - Wikipedia

   en.wikipedia.org/wiki/Wikipedia_talk:Preparing...

   Gif images don't seem to have this problem at wikipedia. Their thumbs and mid-size images use less kilobytes than their full-size images. My suggestion is that people load png images at around 450 pixels wide since they can be shown on wikipedia pages without being reduced first to thumbs or mid-size images. Text can flow around those images.

7. Help:Pictures - Wikipedia

   en.wikipedia.org/wiki/Help:Pictures

   Since the MediaWiki software dynamically scales inline images there is no technical reason to reduce file size via scaling or quality reduction when uploading images, although non-free images may require scaling due to copyright concerns (consult the non-free image resolution guidelines). Also, compressing PNGs may be useful, because PNG files ...

8. NTFS - Wikipedia

   en.wikipedia.org/wiki/NTFS

   Data is compressed in 16-cluster chunks (up to 64 KB in size); if the compression reduces 64 KB of data to 60 KB or less, NTFS treats the unneeded 4 KB pages like empty sparse file clusters—they are not written. This allows for reasonable random-access times as the OS merely has to follow the chain of fragments.

9. File:Utility maximising bundle when demand is negative.png

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

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.