Windows bitmap (BMP) format is a bitmap image, typical of the Microsoft Windows operating system. You can save images in 24-bit (16.7 million colors), 8-bit (256 colors) and less. Can these files be compressed without loss of quality: RLE (Run-length encoding). The bitmap files are composed of associated color coded addresses, one for each frame in a pixel array such as a picture of "colored boxes" for small children esquematizaría. Typically, they are characterized by being very inefficient in its use of disk space, but may show a good level of quality. Unlike vector graphics, to be rescaled to a larger size, they lose quality.
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 supports palette-based images (with palettes of 24-bit RGB or 32-bitRGBA 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.