Help:Visual file markup/upright

Normally a thumbnail has a width of 220 pixels (px). This width is used by typical readers, who have not logged in or who have not changed their preferences. The " " option normally creates an image that is about 75% of the width of the default. The exact width is computed by starting with the default thumbnail width, multiplying it by 0.75, and rounding to the nearest multiple of 10.

Standard behaviour (upright not specified)
The standard behaviour can make a tall, thin picture come out too large. For example:





Upright images
The " " option can help fix this by informing the Wikipedia layout system that the image should have a narrower width than usual:





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 " " at all; a factor less than or greater than 1.0 creates an image smaller or larger than the default. For example:
 * Shrinking upright images further





Short, wide images
Short, wide images sometimes benefit from " " factors greater than 1.0. Factors greater than about 2.5 can generate large images that cause problems with some browsers; for one way to handle wider images, see panoramas. Although many image types, such as JPEG and PNG, do not handle enlargement well, SVG images have no problem with it. For example:

