Printed matter decorates our lives and adds rich colors to them. So what are the characteristics of qualified printing? Printing is very popular, and there are many problems to be noted. Since I have worked in a printing factory in Jinan for several years, I would like to briefly analyze eight different colors and some pre press design considerations based on my personal experience.

　　一、灰平衡，根據(jù)理論和生產(chǎn)實(shí)踐經(jīng)驗(yàn)，印刷品色彩更難控制的就是灰平衡。灰平衡是在一定的印刷適性,黃色、紅色和藍(lán)色由淺到深的三原色版疊印的比例按照一定的網(wǎng)絡(luò)組合不同亮度脫色(白色、淺灰色、灰色、深灰色,黑色),視覺上的中性灰色的顏色,許多因素影響使用的油墨,紙張、印刷、濃度的完整版本,點(diǎn),疊印和屏幕行號(hào),相關(guān)影響灰平衡,這是對(duì)機(jī)器精度和操作人員技能水平的測(cè)試。

　　1. Grey balance. According to the theory and production practice, the most difficult thing to control is grey balance. The gray balance is suitable for certain printing. The three primary colors of yellow, red and blue, from light to dark, are overprinted in proportion to different brightness decolorization (white, light gray, gray, dark gray, black) according to a certain network combination. The color of neutral gray in vision. Many factors affect the ink used, the complete version of paper, printing and concentration, dot, overprint and screen line number, and the related influence on gray level This is a test of the accuracy of the machine and the skill level of the operator.

　　二、四色屏和三色屏，全色不打印(建議使用專色打印)。

　　2. Four color screen and three color screen, full color printing is not allowed (spot color printing is recommended).

　　不懂印刷設(shè)計(jì)的人更難印刷。色彩一方面是過多的多色極細(xì)的線條，很小的字透白等。

　　People who don't understand print design are the hardest to print. On the one hand, the color is too many multi-color and very thin lines, and very small words are white.

　　四、C=50M=50Y=50K=50的大平網(wǎng)，顏色有點(diǎn)不對(duì)嚴(yán)重。

　　IV. for the large flat net with C = 50m = 50y = 50K = 50, the color is not serious.

　　五、正文有四種顏色，即cmyk正文中有四種顏色，尤其是小字，很難覆蓋，對(duì)機(jī)器紙牙的要求非常高。這也是一個(gè)常見的問題，所以印前設(shè)計(jì)師必須檢查出版物文件中的黑色文字，特別是小字，是否只出現(xiàn)在黑色版本上，而不應(yīng)該出現(xiàn)在其他三種顏色上。如果是這樣，打印出來的成品質(zhì)量會(huì)大大降低，當(dāng)RGB圖形轉(zhuǎn)換成CMYK圖形時(shí)，黑色的文字一定會(huì)變成四色黑色。除非另有規(guī)定，否則必須處理。

　　5. There are four colors in the text, that is, there are four colors in the CMYK text, especially the small characters, which are difficult to cover, and the requirements for the machine paper teeth are very high. This is also a common problem, so the pre press designer must check whether the black text in the publication documents, especially the small characters, only appear in the black version, rather than in the other three colors. If so, the quality of the printed product will be greatly reduced. When RGB graphics are converted into CMYK graphics, the black text will certainly become four-color black. Must be dealt with unless otherwise specified.

　　六、有一個(gè)黑色的底座也很難對(duì)付。黑色底色為了達(dá)到效果可以使用特殊的黑色油墨或打印兩次，打印起來并不難，更省力。

　　6. It's hard to deal with a black base. Black background color in order to achieve the effect, you can use special black ink or print twice, printing is not difficult, more labor-saving.

　　七、數(shù)色網(wǎng)點(diǎn)疊放，尤其是網(wǎng)點(diǎn)70%以上。具體來說，深褐色、棕褐色、深綠色(平板屏幕，含藍(lán)色70個(gè))、深藍(lán)色、紫藍(lán)色由于存在色差，在印刷機(jī)上不容易找到平衡，所以很難印刷出色彩。

　　7. Digital dot overlay, especially over 70% dot. Specifically, due to the color difference between dark brown, Tan, dark green (including 70 Blue flat screens), dark blue and purple blue, it is not easy to find a balance on the printing machine, so it is difficult to print out colors.

　　八、在印刷一般全版物時(shí)，專色全版或面積較大、反白字、標(biāo)志相同、色塊相同的情況下，一般很難跟色，容易產(chǎn)生色差、鬼影、擦臟、劃傷現(xiàn)象。

　　VIII. When printing general full page materials, when the spot color full page or large area, anti white characters, signs are the same, and color blocks are the same, it is generally difficult to follow the color, and it is easy to produce color difference, ghost shadow, dirt and scratch.

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