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There are at least three issues to be considered: First is the licensing aspect of using the image. In order for an image to be used at Wikipedia, the image must be unambiguously licensed to be compatible with Wikipedia's free-use licenses, which are CC BY-SA and GFDL.
The PNG (Portable Network Graphics) file format was created as a free, open-source alternative to GIF. The PNG file format supports 8-bit (256 colors) paletted images (with optional transparency for all palette colors) and 24-bit truecolor (16 million colors) or 48-bit truecolor with and without alpha channel – while GIF supports only 8-bit ...
PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF)—unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF". [ 6 ] PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and ...
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.
libpng is the official Portable Network Graphics (PNG) reference library (originally called pnglib). It is a platform-independent library that contains C functions for handling PNG images. It supports almost all of PNG's features, is extensible, and has been widely used and tested for over 28 years.
Profile_28.png (258 × 315 pixels, file size: 4 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The structure of MNG files is essentially the same as that of PNG files, differing only in the slightly different signature (8A 4D 4E 47 0D 0A 1A 0A in hexadecimal, where 4D 4E 47 is ASCII for "MNG" – see Portable Network Graphics: File header) and the use of a much greater variety of chunks to support all the animation features that it provides.
Original file (1,080 × 1,080 pixels, file size: 30 KB, MIME type: image/png) This is a file from the Wikimedia Commons . Information from its description page there is shown below.