Common thumbnail sizes

MediaWiki stores thumbnails indefinitely, so using lots of different thumbnail sizes can result in lots of storage taken up by thumbnails. This page is an attempt to coordinate to use common sizes. Unless otherwise noted, the sizes mean width in pixels.

Relevant configuration settings

 * : Sizes pre-rendered on upload. Default: none; Wikimedia: 320, 640, 800, 1024, 1280, 1920
 * : In-article thumbnail sizes available as user preference. Default: 120, 150, 180, 200, 250, 300; Wikimedia: 120, 150, 180, 200, 220, 250, 300, 400
 * : thumbnail size used in articles when the size is not specified in the wikitext and the user has not set their preference. Default: 5 (300px); Wikimedia: 4 (220px)
 * : Whether to provide alternative image sizes for high-DPI displays. When enabled, article thumbnails, galleries, and images on file pages will have an srcset with 1.5x and 2x of the original size. Default: true, Wikimedia: same
 * : Scaling factor applied to the  value for thumbnails where the   wikitext option is used. Default: 0.75 (225px), Wikimedia: 0.75 (165px)
 * : Image sizes in galleries (when not overriden in the  tag). For traditional galleries, the   and   options are used as a bounding box to determine physical thumnail size; for   galleries, width is ignored and   is used. Default: none (does that mean falling back to  ?); Wikimedia: 120x120
 * : File description page image sizes available as user preference; also used for the list of download links under the image. Values are bounding boxes. Default: 320x240, 640x480, 800x600, 1024x768, 1280x1024, 2560x2048; Wikimedia: same.
 * : Image size used on file description pages when the user has not set their preference. Default: 2 (800x600), Wikimedia: same
 * : Intermediary thumbnail sizes to use to speed up thumbnail rendering (automatically generated when the image is first thumbnailed). Default: none, Wikimedia: 1920 (not sure Thumbor uses it though)