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Most image links are created using the [[File:...]] syntax, and clicking on such an image follows a link to a page with information about the image itself, including the licensing terms. However, it is sometimes desirable to have images that link to other pages.
Link Link the image to a different resource, or to nothing. Alt Specify the alt text for the image. This is intended for visually impaired readers. See WP:ALT for how this should typically differ from the caption. Page Specify a page other than 1 to use for the thumbnail image in multipaged files. Langtag
If the image is in the public domain, not requiring attribution to the uploader, you can create a plain picture that links to some other location by using the link option. To link to some other page, specify its name in the link option along with an appropriate caption that hints to readers what will happen if they click on the link.
The image acts as a hypertext link to the specified page. Do not enclose the page name in square brackets. If Page is a URL, the image acts as an external link; otherwise it links to the named Wikipedia page. Image maps offer more possibilities. [[File:Example.png| link=Name of page |alt=Example alt text]]
The data URI scheme is a uniform resource identifier (URI) scheme that provides a way to include data in-line in Web pages as if they were external resources. It is a form of file literal or here document.
MediaWiki software detects URI schemes and/or filename extensions to create a link; thus links without a URI will not have an external link applied. MediaWiki does not attempt to detect any part of the URL to create a link, such as www, which many websites do not use in the URL.
The new version will now automatically be accessed by the pages that link to the file, but will keep the old version in the "File History" section of the file description page. If you cannot find the link to "upload a new version of this file" it's possible that you are not looking at the original source page of the file.
PNG is a raster graphics format, encoding the value of each individual pixel, while SVG is a vector graphics format that encodes an image as a series of geometric shapes. If this confuses you, don't worry; you don't need to understand the technical aspects to create or upload images.