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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.
Alternatively, and only where absolutely necessary, users' preferences may be disregarded and the size of the image fixed by specifying a size in pixels: Width px or x Height px or Width x Height px. Scale the image to be no greater than the given width or height, keeping its aspect ratio.
Image scaling can be interpreted as a form of image resampling or image reconstruction from the view of the Nyquist sampling theorem.According to the theorem, downsampling to a smaller image from a higher-resolution original can only be carried out after applying a suitable 2D anti-aliasing filter to prevent aliasing artifacts.
An image of N pixels height by M pixels wide can have any resolution less than N lines per picture height, or N TV lines. But when the pixel counts are referred to as "resolution", the convention is to describe the pixel resolution with the set of two positive integer numbers, where the first number is the number of pixel columns (width) and ...
JPEG files usually have a filename extension of "jpg" or "jpeg". JPEG/JFIF supports a maximum image size of 65,535×65,535 pixels, [ 12 ] hence up to 4 gigapixels for an aspect ratio of 1:1. In 2000, the JPEG group introduced a format intended to be a successor, JPEG 2000 , but it was unable to replace the original JPEG as the dominant image ...
The capitalization in the wikicode must be followed; thus if an image file is Image:Photo of Wikipede.JPG, you will need to use the capital letters for "JPG". The image is blacklisted on MediaWiki:Bad image list .