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When not using a GIF animation at its original frame size, consider creating an Ogg Theora movie of the animation. Animated PNG images with a frame size larger than 12.5 million pixels cannot currently be displayed in thumbnail form in Wikipedia articles, a significantly lower limit than the GIF format, and is not fully supported on all browsers.
A Wikipedia reader can click on the thumbnail, or on the small double-rectangle icon below it, to see the corresponding file page which will let the user see the image in its original size. Although the above text may appear in multiple lines for formatting purposes, the actual image text is on one line, as it uses spaces without any line breaks.
Under the image there should be a set of numbers in the form "NNNNxMMMM." This is the size of the image in pixels. If these numbers do not appear, then the image is smaller than the limit you specified for display in the "Files" pane in your preferences. If you did not adjust that limit, the default size is 800x600 pixels.
The available values for thumbnail size in Preferences (on the Appearance tab) are 120px, 150px, 180px, 200px, 220px (default), 250px, 300px, and 400px. As explained at Wikipedia:Extended image syntax § Size, upright=Factor will "adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10".
image_upright should normally be left blank, so that the size defaults to the size set in a user's preferences. alt should be set to a description of the image for visually impaired readers. See WP:ALT. Do not use this for another copy of the caption or of the article title, as the reader will already be aware of these.
The size of animated images is judged less strictly, though larger is still preferred. Further information on image size can be found here . Exceptions to this rule may be made where justified on a case-by-case basis, such as for historical, technically difficult or otherwise unique images, if no higher resolution could realistically be acquired.
A gallery displays several pictures in an array or similar layout. Galleries can display images formed into rows and columns by use of the <gallery>...</gallery> parser (conversion of Wikitext to HTML) tag.
Wikipedia:Picture of the day is an image which is automatically updated each day with an image from the list of featured pictures. The {{ POTD }} template produces the image shown above. Category:Wikipedia Picture of the day lists the different templates that can be used.