WBMP is a raster image format that differs by using only two colors. WBMP files are a black and white bitmap image. It is a standard form for optimizing raster images for mobile devices in a single-bit color. The name is an abbreviation for Wireless Bitmap. WBMP is an analogue of the BMP graphic image format, but unlike it supports only monochrome 1-bit images. The WBMP format is widely used in mobile phones and PDAs; files of this format can be part of the forwarded SMS messages.
PNG is a raster image format developed by PNG Development Group. The name PNG is an abbreviation for Portable Network Graphic. This image format is used primarily on the Internet for posting on web pages, since PNG files use Deflate compression without losing quality. The development of this format was undertaken in order to replace the GIF format, to which there were many complaints. PNG's image quality and specifications were much better, but unlike GIF, it does not support animation and uses the CMYK palette.