BMP (Bitmap) is an image file format used to store bitmap digital images. Initially the format could store only DDB (Device Dependent Bitmap) but today the BMP format stores device-independent rasters (DIB - Device Independent Bitmap). Color depth in this format varies from 1 to 48 bits per pixel. The maximal image size is 65535×65535 pixels. An image can be compressed, but it is often stored uncompressed and has a large file size. Many programs work with the BMP format because its support is integrated into Windows and OS/2.