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In the examples above, the size of the image is scaled based on each user's default image size, which can be changed at Special:Preferences. Setting image size in pixels, such as "250px", would override the user's preference and display the image as 250px wide for all users who view that image on that page.
Specifying a size does not just change the apparent image size using HTML; it actually generates a resized version of the image on the fly and links to it appropriately. This happens whether or not you specify the size in conjunction with "thumb". This means the server does all the work of changing the image size, not the web browser of the user.
Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.
U.S. patent 6,225,973 – Mapping samples of foreground/background color image data to pixel sub-components; U.S. patent 6,243,070 – Method and apparatus for detecting and reducing color artifacts in images; U.S. patent 6,393,145 – Methods apparatus and data structures for enhancing the resolution of images to be rendered on patterned ...
The International Dunhuang Project Standards for Digitization and Image Management specifies a height of 96 pixels at 72 ppi. [8] YouTube recommends the resolution of 1280×720 (with a minimum width of 640 pixels) with an aspect ratio of 16:9. [9] DeviantArt automatically produces thumbnails that are maximum 150 pixels in the long dimension.
Except with very good reason, do not use px (e.g. |thumb|300px), which forces a fixed image width measured in pixels, disregarding the user's image size preference setting. In most cases upright= scaling_factor should be used, thereby respecting the user's base preference (which may have been selected for that user's particular devices).
The Office 2000 version sets the display resolution metadata of BMP files to 0 by 0, regardless of what resolution is set through the program UI. Version 3.0.2.3 and earlier have a 10 megapixel resolution limit. Large bitmap BMP files can be opened in Microsoft Photo Editor 3.0.2.3, as well as, e.g. a 4000×2578 (10.3 megapixels), 15 MB JPEG image.
The fix is to open the SVG file in a text editor, find the <image> element, locate "image/jpg", change it to "image/jpeg" and re-save. At right is an example of this problem. The Commons SVG Checker looks for this problem; see Commons:Commons:Commons SVG Checker/KnownBugs#Checks for details.