PNG File Format
PNG, Portable Network Graphics, raster graphics file format was created as the free, open-source successor to GIF. .png file format supports 8 bit paletted images and 24 bit truecolor or 48 bit truecolor with and without alpha channel. The lossless PNG format is best suited for pictures still under edition - and the lossy formats. PNG provides a patent-free replacement for GIF.
PNG image format is designed to work will in online viewing applications like web browsers. PNG also can store gamma and chromaticity data for improved color matching on heterogeneous platforms. he PNG format is widely supported by graphics programs, including Adobe Photoshop, Corel's Photo-Paint and Paint Shop Pro, the GIMP, GraphicConverter, Helicon Filter, etc. PNG compatible browsers include: Apple Safari, Google Chrome, Mozilla Firefox, Opera, Internet Explorer 7/8/9, etc.