PNG: Portable Network Graphic

PNG was designed for use on the Internet and is the most largely used image compression format on the web. PNGs are not for printing professional graphic images. PNGs are raster graphics and were made as an improvement to the GIF. PNGs work well with line art images and photographs for websites but can result in really large file sizes. PNGs also offer alpha transparency which is very cool because each individual pixel has its own level of opacity. PNGs come in two types PNG-8 and PNG-24. PNG-8 means that the file has only 8 bits per pixel and the PNG-24 has 24 bits per pixel.