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When converting an image from the PNG format to GIF, the image quality may suffer due to posterization if the PNG image has more than 256 colors. GIF intrinsically supports animated images. PNG supports animation only via unofficial extensions (see the section on animation, above). PNG images are less widely supported by older browsers.
Also, images that are used on the Main Page have a local version to prevent vandalism from appearing. Editors can also choose to have a local version stored on Wikipedia. Images are classified as files and use the prefix of File: or the deprecated prefix of Image:. The File namespace is one of several namespaces used on Wikipedia.
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Compared to JPEG, PNG excels when the image has large, uniformly colored areas. Even for photographs – where JPEG is often the choice for final distribution since its lossy compression typically yields smaller file sizes – PNG is still well-suited to storing images during the editing process because of its lossless compression.
Google Image Search – Advanced search can search for free licensed or PD works. By default, Google does not filter based on license. Add the following (without quotes) to your search URL to display only images with licensing appropriate for Wikipedia: "&tbs=sur:fmc" Stockjo.com – Collection of Free Stock Resources
Offer to add a link to the copyright holder website on the image page; Thank the copyright holder for their time; If you receive permission, add the credits to the image page as promised, for example on Image:FremontTroll.jpg. Don't forget to thank the photographer and provide them with links to the image page and the article(s) using the image!