Printing terminology - what is paper, color, and print

　　The order is a unit of paper. The printing paper is made of 500 sheets of paper.

　　Color is the basic unit of measurement for color printing. One order paper (all 500 pieces) is printed once for one color, and the two is a two color order, and the other is analogous. It is customary to measure the specifications as the standard of opening, one color is equal to 100 () sheet for opening the paper once, also known as the opening order or the opening of a thousand prints. Such as 1000 of the specification of paper printing four-color image, the color print is 4.

　　Is the calculation of the length of the sheet publication unit, a folio called a sheet printed on both sides.