Note that a digital image has a regular grid of picture elements (pixels) arrayed in columns and rows within a rectangular boundary. Each pixel has an associated color. The RGB model is commonly used to represent the intensity of each of the hues (or colors) red, green, and blue. In the RGB model, black and white are represented as the absence of intensity of R, G, and B, while white is represented by the greatest intensity of R, G, and B.The BMP file format is somewhat of a "gold standard" of representing an image in the most basic manner, as no "gimmicks" are used in the coding which represents the colors of each pixel. It is a format which can serve as a starting point for deriving images of other file formats which may involve "compression," a means for shrinking the required file size needed to present a good picture.Often, 256 equal steps between no intensity and maximum intensity provide a fineness of intensity levels of each hue that is satisfactory for most work. In decimal (base 10) numbers, this represents 0 through 255. There are hexadecimal numbers (base 16) that correspond to each of the decimal values 0 through 255, and they are often used instead of decimal numbers to represent these intensities.Hexadecimal representations are a natural outgrowth of working with binary (base 2) numbers, as they convey all necessary data elements that represent binary numerals 0 to 15, and do so in the most efficient way.