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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.
Original file (5,489 × 2,866 pixels, file size: 1.6 MB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The High Efficiency Image File Format (HEIF) is an image container format that was standardized by MPEG on the basis of the ISO base media file format. While HEIF can be used with any image compression format, the HEIF standard specifies the storage of HEVC intra-coded images and HEVC-coded image sequences taking advantage of inter-picture ...
Animated PNG images with a frame size larger than 12.5 million pixels cannot currently be displayed in thumbnail form in Wikipedia articles, a significantly lower limit than the GIF format, and is not fully supported on all browsers. A JPEG or other compressed image format can be much smaller than a comparable GIF or PNG format file. When there ...
JPEG for photographic images. GIF for animated images. PNG for everything else. While some formats offer multiple compression systems, in general the format and the compression system are tied together. Other image formats should be avoided in most cases: BMP - Images are uncompressed, resulting in larger file sizes. Should usually be converted ...
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These images were uploaded in a format such as GIF or JPEG. It is suggested that the original sources be revisited and that PNG files be uploaded in their places. For more information, see Wikipedia:Preparing images for upload. Images can be added to this category by placing the {{ShouldBePNG}} template on the image description page.
In general, if you have a good image that is in the wrong format, convert it to the correct format before uploading. However, if you find a map, flag, etc. in JPEG format, only convert it to PNG if this reduces the file size. For further advice on converting JPEG to PNG, see Wikipedia:How to reduce colors for saving a JPEG as PNG.