PNG (Portable Network Graphics) is a file format that contains bitmaps or raster images. It was introduced to make the transfer of images on the web easier. PNG uses lossless compression resulting in high image quality as compared to JPEG formats. PNG files support 24-bit RGB color palettes, grayscale images, RGB and RGBA images as well as transparency channel 8 bit. The format, however, does not support other color spaces or CMYK which are suitable for professional-quality print graphics.