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| Name | PNG | ICNS |
| Full name | PNG - Portable Network Graphics | ICNS, Mac OS X Icon Resource File |
| File extension | .png | .icns |
| MIME type | image/png | |
| Developed by | PNG Development Group | Apple |
| Type of format | lossless bitmap image format | System |
| Description | Portable Network Graphics (PNG) is a raster graphics file format that supports lossless data compression. PNG was created as an improved, non-patented replacement for Graphics Interchange Format (GIF), and is the most used lossless image compression format on the Internet. PNG itself does not support animation at all. MNG is an extension to PNG that does; it was designed by members of the PNG Group. | Icon files used on MAc computers and other OS X devices use the file extension ICNS. These icon files are used to display a small image (icon) in the OSX Finder or dock, representative for an application which it is linked to. ICNS files support images in a variety of dimensions. They range from 16x16 pixels to 512x512 pixels. As of OS X Mountain Lion, ICNS files can support even bigger images, namely of the 1024x1024 pixels dimension. |
| Technical details | PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without alpha channel), and full-color non-palette-based RGB[A] images (with or without alpha channel). PNG was designed for transferring images on the Internet, not for professional-quality print graphics, and therefore does not support non-RGB color spaces such as CMYK. | The content of the ICNS file typically consists of one or more images in the PNG format. This format is pretty handy as a base for the ICNS since it allows transparency. The ICNS file supports 1-bit as well as 8-bit alpha channels. What differentiates them from Windows' ICO files is that ICNS files can contain individual icon resources, thus acting more like a container file. |
| File conversion | PNG conversion | ICNS conversion |
| Associated programs | Adobe Photoshop, Paint Shop Pro, the GIMP, GraphicConverter, Helicon Filter, ImageMagick, Inkscape, IrfanView, Pixel image editor, Paint.NET, Xara Photo & Graphic Designer. | Adobe Photoshop with IconBuilder for Mac Plugin (Mac), Apple Preview (Mac), Axialis IconWorkshop (Windows), Folder Icon X (Mac), Icon Machine (Mac), Iconographer (Mac), Inkscape (Windows, Mac & Linux), Snap Converter (Mac), XnViewMP (Windows, Mac & Linux) |
| Wiki | https://en.wikipedia.org/wiki/Portable_Network_Graphics | https://en.wikipedia.org/wiki/Apple_Icon_Image_format |