Image, pronounced tú xiàng, is a Chinese word, which means painted, photographed or printed images.
Images are the basis of human vision, the objective reflection of natural scenery, and an important source for human beings to know the world and themselves. "Picture" refers to the distribution of light reflected or transmitted by an object, and "image" refers to the impression or understanding formed in the human brain by the picture accepted by the human visual system.
Photos, paintings, clip art, maps, calligraphy works, handwritten sinology, faxes, satellite cloud pictures, film and television pictures, X-rays, electroencephalograms, electrocardiogram, etc. It's all images.
Image features
Images use numbers to describe pixel points, intensities and colors at will. Description information file has a large storage capacity, and the described object will lose details or produce sawtooth when it is scaled. In the aspect of display, it presents the color information of each point after object analysis in a digital way with a certain resolution, which can be displayed directly and quickly on the screen. Resolution and gray level are the main parameters that affect the display.
Images are suitable for representing objects with a lot of details (such as light and dark changes, complex scenes and rich outlines), such as photos and drawings. Complex images can be processed by image software to obtain clearer images or produce special effects.