由于印刷方面的各種因素，彩色印刷原稿的質(zhì)量存在很多問(wèn)題，如：偏色、暈虛、顆粒感強(qiáng)、缺少層次等等問(wèn)題。所以要得到高質(zhì)量掃描彩印原稿本，所以濟(jì)南彩色設(shè)計(jì)印刷技術(shù)人員需要根據(jù)不同的情況做具體的掃描措施，對(duì)原稿進(jìn)行特定的矯正操作。那么彩色印刷如何處理原稿色偏問(wèn)題？

Due to various factors in printing, there are many problems in the quality of color printing originals, such as color deviation, halo, strong graininess, lack of layers, and so on. Therefore, in order to obtain high-quality scanned color printing original manuscript, Jinan color design and printing technicians need to take specific scanning measures according to different situations and carry out specific correction operations on the original manuscript. So how to deal with the color deviation of the original in color printing?

在原稿色彩質(zhì)量的分析中，若原稿的三色密度與反差基本是相同的，說(shuō)明原稿不偏色，色調(diào)基本正常。如果階調(diào)齊全、層次豐富、分布合理，即使總反差略有差別，都可算是正常原稿。其顏色復(fù)制可按正常的色誤差數(shù)據(jù)進(jìn)行校正，側(cè)則放在階調(diào)層次復(fù)制方面。

In the analysis of the color quality of the original, if the density and contrast of the three colors of the original are basically the same, it means that the original is not biased and the tone is basically normal. If the scale is complete, the level is rich, and the distribution is reasonable, even if the total contrast is slightly different, it can be regarded as a normal manuscript. The color reproduction can be corrected according to the normal color error data, and the emphasis is on the gradation reproduction.

若原稿的三色密度高低不同，說(shuō)明偏向某一偏色，但三色密度的反差基本相等，是均衡偏色，多為色灰霧所致。這種偏色稿，一般階調(diào)層次還較好，可以用改變分色圖片高、低調(diào)三色網(wǎng)點(diǎn)記錄設(shè)定，并配合中調(diào)層次調(diào)整，使三色版圖片達(dá)到全階調(diào)即達(dá)到灰平衡再現(xiàn)，來(lái)圖像偏色。但好是根據(jù)三色密度曲線，設(shè)計(jì)出調(diào)整三色灰平衡的層次復(fù)制曲線，能使全階調(diào)的色調(diào)得到統(tǒng)一糾正。

If the trichromatic density of the original is different, it means that it is biased towards a certain color deviation, but the contrast of the trichromatic density is basically the same, which is caused by balanced color deviation, mostly due to color fog. This kind of color deviation draft has a good level of tonality. You can change the recording settings of high and low tone tri color dots of color separation picture, and coordinate with the adjustment of middle note level to make the tri color plate picture reach full level, that is, achieve gray balance reproduction, to eliminate image color deviation. But the good thing is that according to the tri-color density curve, a hierarchical reproduction curve is designed to adjust the tri-color gray balance, which can make the hue of the full-scale tone be uniformly corrected.

若原稿的高光三色密度基本一致，只有暗調(diào)端的三色密度不同，密度反差也不等，在中暗調(diào)表現(xiàn)明顯偏色。暗調(diào)層次略有損失，中高調(diào)層次正常。可以改變分色圖片暗調(diào)三色網(wǎng)點(diǎn)記錄設(shè)定，或附加某色的全調(diào)底色去除（只對(duì)混合復(fù)色有作用），來(lái)三色記錄圖片在暗調(diào)端的偏色。好也由三色密度曲線推導(dǎo)設(shè)計(jì)出調(diào)整灰平衡的三色層次復(fù)制曲線，能按準(zhǔn)確數(shù)據(jù)糾正其偏色。

If the highlights of the original are basically the same, only the three color densities at the dark end are different, and the density contrast is also different, and the color deviation is obvious from the middle to the dark. The level of low key is slightly lost, and the level of medium and high key is normal. You can change the setting of the darkened three-color dot recording of the color separation picture, or add the full-tone background color removal of a certain color (only effective for mixed multi-color) to eliminate the color deviation of the three-color recording picture at the darkened end. It is also good to derive and design a three-color hierarchical replication curve to adjust the gray balance from the three-color density curve, which can correct its color deviation according to accurate data.

如果彩印原稿三色密度曲線是交叉的，其圖像色調(diào)偏向于一種顏色，而暗調(diào)端則偏向另一顏色，這是感光片本身三色平衡失調(diào)而造成的交叉偏色。其各級(jí)階調(diào)層次都不良，在掃描儀或分色機(jī)上直接用改變?nèi)珜哟握{(diào)整與記錄設(shè)定來(lái)糾正其偏色就不容易，必需依據(jù)其三色密度曲線，推導(dǎo)設(shè)計(jì)出精確的調(diào)整灰平衡三色層次復(fù)制曲線，指導(dǎo)其三色層次調(diào)整與記錄設(shè)定，方能使其復(fù)制效果稍有改善。偏色密度差距在0.2以上者，一般就很難矯正復(fù)制。

If the tri-color density curve of the color printing original is crossed, the image hue is biased towards one color, and the dark end is biased towards another color, which is the cross color deviation caused by the imbalance of the tri-color balance of the photographic film itself. It is not easy to correct the color deviation by changing the adjustment and recording settings of the three color levels directly on the scanner or color sorter. It is necessary to derive and design an accurate adjustment gray balance three color level replication curve based on its three color density curve, and guide its three color level adjustment and recording settings, so as to slightly improve its replication effect. It is generally difficult to correct and copy the color deviation density difference above 0.2.

這也就解釋了為什么印刷品出現(xiàn)變色的問(wèn)題。畫(huà)冊(cè)、書(shū)刊、報(bào)紙、年畫(huà)、廣告畫(huà)等印刷產(chǎn)品，在陽(yáng)光、燈光的照射下，通過(guò)油墨色料選擇性的吸收和反射，才能呈現(xiàn)出五彩繽紛、萬(wàn)紫千紅的顏色。更多相關(guān)內(nèi)容就來(lái)我們網(wǎng)站http://m.6741.net.cn進(jìn)行咨詢吧！

This also explains the problem of color change in printed matter. Printed products such as picture albums, books and periodicals, newspapers, New Year pictures, and advertising pictures can only show colorful and colorful colors through selective absorption and reflection of ink and color under the irradiation of sunlight and light. Come to our website for more relevant content http://m.6741.net.cn Consult!