This means that scaling PNG images produces fairly large files even if the original image contained a palette, or was in grayscale format. Currently, (PNG, GIF, JPEG) thumbnails are generated in the same format as the original image and are always in 24-bit color (unless the image is GIF, in which case the resulting image will have 256 colors). Unfortunately the image scaling system is still limited. See also: Commons:Maximum file size Note that new PNG resizing software has been installed since the text below has been written. These can be losslessly converted to PNG, and the file size will always be smaller. On Wikimedia Commons, the file types we recommend are: SVG, PNG, and JPEG.īMP files are not allowed on Commons. Fortunately, this is usually not difficult, but can be time-consuming (depending on the format and desired output quality). Non-free formats and unsupported free formats must be converted to a supported free format before uploading. Patent-encumbered formats fail to meet this standard. Our mission requires content to be freely redistributable to all. Examples of patent-encumbered file formats are AAC, WMA, and most AVI codecs. For a list of allowed file formats see the sections below. Patent-encumbered file formats are not accepted at Wikimedia Commons. Likewise, ONLY free file formats are allowed. Wikimedia Commons only accepts “free content”. 8 Requesting support for new file types.
