The scanner's performance indicators mainly include resolution, gray level and color number, in addition, scanning speed, scanning format and so on.
The shape of the scanner varies greatly, but it can be divided into four categories: pen type, handheld type, platform type, and roller type. Their sizes, accuracy, and prices are different. The accuracy used in different occasions is also the resolution. Different, can be from a few hundred points to several thousand points per inch.
Pen and hand-held precision is not very high, but it is easy to carry, and is generally used for personal desktop and notebook computers.
The accuracy of flatbed scanners is in the middle. It has the characteristics of versatility, powerful functions and moderate prices. It has been widely used in many fields such as graphic image processing, electronic publishing, advertising production, office automation and so on. The most high-end is the cylinder scanner, which is used in the field of professional printing.
From the color output after processing the information, the scanner can be divided into black and white (grayscale) and color. The amount of information input and output by color scanners is more, and the prices are continuously lowering. Now it is becoming more and more popular.
Copying is not to draw an extremely realistic picture, but to learn in the process of copying, why the color relationship in this place is like this, why this kind of physical structure is used here, and so on, we need to think about it. Using the copy table to copy, can make the copied works more intuitively displayed in front of you, light, color, space, body structure, material texture, etc., clearly feel the thickness change of each line of the work, the color gradient process, And then in the process of copying the analysis and understanding thoroughly.
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