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thumb (or thumbnail) Automatically scale the image, and put a box around it. Show a caption if specified. Float the image on the right unless overridden with the location attribute. With an operand, e.g. thumb=Example.png, the operand names an image that is used as the thumbnail, ignoring any size specification. frame
[[File:Example.png|thumb| upright |alt=Example alt text|Example caption]] Adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10. For instance, " upright=1.5 " makes the image larger, which is useful for maps or schematics that need to be larger to be readable.
Articles carry reduced-size 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 the upright factor 0.75 is too large or too small, it can be specified explicitly. A factor of 1.0 uses the default thumbnail width, which is the same as not specifying "upright" at all; a factor less than or greater than 1.0 creates an image smaller or larger than the default. For example:
The frameless option causes a plain picture to default to the same size as a thumbnail. As with thumbnails, the default can be adjusted with the upright=factor option. If you use the common default of 220 pixels for thumbnail widths, the following example image's width will be 220 × 0.2 pixels, which rounds to 40 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".
This parameter specifies the initial height to render every image thumbnail, before images are possibly scaled up (keeping their size ratio) by JavaScript to fill rows; when needed the Javascript will query the image server to get resized thumbnails for several scales between 100% (the initial height specified) and about 125%. This gives good ...
Size (bytes) Description Xthumbnail: 1: Horizontal pixel count of the following embedded thumbnail. Must not be zero Ythumbnail: 1: Vertical pixel count of the following embedded thumbnail. Must not be zero Thumbnail data: 3 × n: Uncompressed 24 bit RGB (8 bits per color channel) raster thumbnail data in the order R0, G0, B0, ...