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Finally, you can link to one image from a thumbnail's small double-rectangle icon , but display another image using "|thumb=Displayed image name". This is intended for the rare cases when the Wikipedia software that reduces images to thumbnails does a poor job, and you want to provide your own thumbnail.
Specifying a fixed size in pixels overrides all of this, but is unfriendly to users who need a larger image. 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.
The packed mode will automatically adjust image sizes to use available display space optimally. Every line specifies an image file. The File: prefix is unnecessary. Captions are optional and are separated from file name by a vertical bar ("|"). A common mistake is to forget the closing </gallery> tag.
Image using width upright=1.8, so that it is 80% wider than the Siberian Husky image above (which is at the default upright=1 width) Image using upright=0.5; a scaling factor less than 1 contracts the image width. An image's size is controlled by changing its width – after which software automatically adjusts height in proportion.
JPEG – a lossy image format widely used to display photographic images, standardized by ISO/IEC; JPEG 2000 – an image format standardized by ISO/IEC; JPEG XL – an image format designed to outperform and replace existing formats. Especially legacy JPEG. Supports both lossy and lossless compression.
Images can often be improved – or even transformed – by using graphics software such as Photoshop or the free GIMP and Paint.NET applications. Many other programs also have photo-enhancing tools, including facilities for semi-automatic image enhancement, so that you need only click a button, or choose a thumbnail, to have a positive effect on image quality.
In Windows, all executables that display an icon to the user, on the desktop, in the Start Menu, or in file Explorer, must carry the icon in ICO format. The CUR file format is an almost identical image file format for non-animated cursors in Microsoft Windows. The only differences between these two file formats are the bytes used to identify ...
Sometimes after uploading a new version of an image the thumbnails in articles still show the old image even if you have bypassed your browser cache (which is especially ugly if the new image is of a different size). Then you need to purge the image page. See Wikipedia:Purge#For images for how to do that.