Digital Basic

Digital Imaging employs a series of data to represent traditional color image or the densitiy of B/W. It is basically the same principle as the telefax image long time ago with a higher resolution and a much complex structure. Telefax image was divided an image into a number of frames. Each frame was classified into gray tones of ten. When the receiving station got all this figures, each frame would be changed into the appropriate gray tones to make a picture.

Digital Imaging nowadays takes color as basic form. By using the Red, Green and Blue, which are the principle colors. Each frame is formed by pixels (picturee element), vertically and horizontally. Each pixel is represented by the RGB values and according to computer display, each color (RGB) has the value from 0 to 255 (8 bits) for a total of 256. All three colors will form a total of 256x256x256=16,777,216. This color scale is called true color, which means that this can meet the requirement of a color image.

Bit is the binary unit for Color Depth. 8 bits means a value from '00000000' to '11111111', which is 0 to 255. For output and display, 8 bits is the maximum in general.