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:''See also: [[Wikipedia:Wikipedia:Image use policy#Displayed image size|Wikipedia:Displayed image size]]'' | :''See also: [[Wikipedia:Wikipedia:Image use policy#Displayed image size|Wikipedia:Displayed image size]]'' | ||
*An image's size is controlled by changing its width | *An image's size is controlled by changing its width - after which software automatically adjusts height in proportion. (Most references to an image's "size" really mean its width.) | ||
*Each user has a "base" width, which applies to <code>|thumb</code> and <code>|frameless</code> images; for ''unregistered'' users (the vast majority of readers) this is always 220 pixels; for ''registered'' (logged-in) users, the base width is 220px when the user's account is created, but can be changed via [[Wikipedia:Help:Preferences#Files|Preferences]]. (The two Siberian Husky images above are displayed at whatever ''your'' base width is.) | *Each user has a "base" width, which applies to <code>|thumb</code> and <code>|frameless</code> images; for ''unregistered'' users (the vast majority of readers) this is always 220 pixels; for ''registered'' (logged-in) users, the base width is 220px when the user's account is created, but can be changed via [[Wikipedia:Help:Preferences#Files|Preferences]]. (The two Siberian Husky images above are displayed at whatever ''your'' base width is.) | ||
*Only where a smaller or larger image is appropriate, use <code>upright|''scaling factor''</code>, which expands or contracts the image by a factor ''relative to the user's base width''. | *Only where a smaller or larger image is appropriate, use <code>upright|''scaling factor''</code>, which expands or contracts the image by a factor ''relative to the user's base width''. | ||
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===Consideration of image download size=== | ===Consideration of image download size=== | ||
Images can greatly increase the [[Wikipedia:bandwidth (computing)|bandwidth]] cost of viewing an article | Images can greatly increase the [[Wikipedia:bandwidth (computing)|bandwidth]] cost of viewing an article - a consideration for readers on slow or expensive connections. Articles carry reduced-size [[Wikipedia:Thumbnail|thumbnails]] instead of full images (which the user can view by "clicking through" the thumbnail) but in some file types a thumbnail's reduced dimensions doesn't translate into a concomitant reduction in file size. (In most browsers you can see a thumbnail's size by right-clicking for its "Properties".) | ||
If one image's file size is disproportionate to those of others in the same article, you may want to reduce it by selecting a different file format: | If one image's file size is disproportionate to those of others in the same article, you may want to reduce it by selecting a different file format: | ||