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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 "<code>upright</code>" 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.
The standard behaviour can make a tall, thin picture come out too large. For example:
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The "<code>upright</code>" option can help fix this by informing the Wikipedia layout system that the image should have a narrower width than usual:
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Short, wide images sometimes benefit from "<code>upright</code>" 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 [[Help:Visual file markup#Panoramas|panoramas]]. Although many image types, such as [[JPEG]] and [[Portable Network Graphics|PNG]], do not handle enlargement well, [[SVG]] images have no problem with it. For example:
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