A poster, not only from its design creativity and layout comparison, poster printing is also their battleground. Posters entered the era of machine printing from hand painting. In the early days, they were always in black and white. Until later, color printing and multi-color printing technology appeared.

彩色印刷的概念是針對黑白印刷，或是單色印刷的概念而言，是用彩色方式復制圖像或文字的復制方式。它包括了許多步驟，或稱轉換過程，才能產生高質量的彩色復制品。

The concept of color printing refers to the concept of black and white printing, or monochrome printing, which is the reproduction of images or characters in color. It involves many steps, or conversion processes, to produce high-quality color reproductions.

多色印刷，英文學名為 polychrome printing 。是指一個印刷過程中，在承印物上印刷兩種及兩種以上的墨色。

Multicolor printing, known as polychrome printing in English. It refers to printing two or more ink colors on the substrate in a printing process.

當前，數碼印刷的主角CtP，可以獲得穩定的網點大小的同時，遇到多色印刷時要想到AM加網的細線和FM加網，抑或是它們的組合，都離不開印刷機的套準精度要求。于印刷機，需要的是能一次通印下來，為此要與所用的油墨色數等同的印刷機組才好。就是說，如果用7種色墨印刷，印刷機也是有7個機組才行，為此多色印刷機應運而生。目前市場已經有單張紙膠印機多12機組的印刷機出售。

At present, CtP, the leading role of digital printing, can obtain a stable dot size. When encountering multi-color printing, it is necessary to think of AM screening fine lines and FM screening, or their combination, which cannot be separated from the requirements of the registration accuracy of the printing machine. As for the printing machine, what is needed is that it can be printed at one time. Therefore, it is better to have a printing unit with the same color number as the ink used. That is to say, if seven kinds of color ink are used for printing, the printing machine also has seven units, so the multi-color printing machine came into being. At present, there are as many as 12 sheet fed offset presses on the market.

一直以來，是以CMYK+175線AM加網作為標準的印刷方式。四色制版膠印(processcolor)幾乎風靡了近半個世紀，隨著數碼相機提供的原稿增多和彩色噴墨印刷的普及，一種不同于4色制版彩印的多色印刷技術(multicolor)進入了實用市場領域。具體地說，它是將彩稿分為6版的hexachrome(六色印刷)和分成7版以上的superfinecolor(超精細彩印)。

CMYK+175 line AM screening has always been the standard printing method. Four color plate making offset printing has been popular for nearly half a century. With the increase of originals provided by digital cameras and the popularity of color inkjet printing, a multi-color printing technology different from four color plate making color printing has entered the practical market. Specifically, it divides the color manuscript into six versions of hexachrome (six color printing) and more than seven versions of super fine color (super fine color printing).

所謂的進入實用市場領域的多色印刷，乃是具有6色乃7色的高度色彩再現性的processcolor。多色印刷之所以能很快發展起來，根因在于它能以四色制版印刷的CMYK數據為基礎實現了寬廣的色調范圍，也就是說，色域比起CMYK數據更加擴大了，甚于把原稿上沒有的色都襯托出來。

The so-called multi-color printing that enters the practical market field is a highly reproducible process with 6 or even 7 colors. The reason why multi-color printing can develop rapidly is that it can achieve a wide range of tones based on the CMYK data of four-color plate printing, that is, the color gamut is more expanded than the CMYK data, and even sets off the colors that are not on the original.