Binary digits are 0 and 1, also known as ons and offs. A pixel with 8 bits per color gives a 24 bit image. CCD are colored in a pixel by pixel method. 16 bit color is 32,000 colors. The method of storing information that maps an image pixel, bit by bit.
Most image files are bit mapped.
Bitmap images are used by all computers. The desktop or screen information for all Windows machines uses .bmp files, while the Macintosh uses pict files. In their normal condition these are greyscale devices. To create color a color pattern is laid down on the sensor pixels, using RGBG color mask. The extra Green is used to create contrast in the image.