Wireless Application Protocol Format bitmap (abbreviated as .wbmp Wireless Bitmap and file extension) is a monochrome graphics file formatoptimized for mobile computing devices. WBMP images are monochrome (black and white) so that the image size is kept to a minimum. A black pixel is denoted by 0 and a white pixel is denoted by 1. For color images, WAP compatible with the Portable Network Graphics format. Used primarily with WML wireless devices.
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.