Spot-color ink refers to a pre-mixed specific color ink, such as fluorescent yellow, Pearl blue, metal gold and silver ink, which is not a CMYK four-color mix, which means precise color.

专色油墨是指一种预先混合好的特定彩色油墨，如荧光黄色、珍珠蓝色、金属金银色油墨等，它不是CMYK四色混合出来的，套色意味着精确的颜色。它有以下四个特性：

Spot-color ink refers to a pre-mixed specific color ink, such as fluorescent yellow, Pearl blue, metal gold and silver ink, which is not a CMYK four-color mix, which means precise color. It has the following four characteristics:

1   精确性。

1. Accuracy.

每一种套色都有其自身固定的色相，所以它可以保证印刷中颜色的精确性，从而在很大水平上处理了颜色传送精确性的问题；

Each color set has its own fixed hue, so it can ensure the accuracy of color in printing, thus dealing with the problem of color transmission accuracy to a large extent.

2   实地性。

2. Fieldwork.

专色普通用实地色定义颜色，而无论这种颜色有多浅。当然，也能够给专色加网（Tint），以呈现专色的恣意深淡色调；

Spot colours are usually defined by solid colours, no matter how light they are. Of course, it can also screen the spot color (Tint) to show the arbitrary dark tone of the spot color.

3   不透明性。

3. Opacity.

专色油墨是一种掩盖性质的油墨，它是不透明的，能够停止实地的掩盖；

Spot-color ink is a kind of cover-up ink, which is opaque and can stop the cover-up on the spot.

4   表现色域宽。

4. Wide gamut.

套色色库存中的颜色色域很宽，超越了RGB的表现色域，更不用说CMYK颜色空间了，所以，有很大一局部颜色是用CMYK四色印刷油墨无法呈现的。

The color gamut in the register stock is very wide, beyond the performance gamut of RGB, let alone CMYK color space, so a large part of the color can not be rendered with CMYK four-color printing ink.

印前运用专色应留意的一些问题

Some Problems Should Be Noticed in the Use of Spot Color before Printing

1   专色颜色称号的统一。

1. Unification of spot color designations.

在不同的软件中，关于完整相同的两种套色，其称号可能会有所不同。如FreeHand把PANIONEI IF5 命名为PANTIONE 1F5CVC。这样一来，当把FreeHand图形对象置入PageMaker中排版时，同样的颜色就会有三种称号，分色输出时就会产生三块印版，形成输出错误。

In different software, there may be different titles for the same two sets of colors. For example, FreeHand named PANIONEI IF5 PANTIONE 1F5CVC. In this way, when FreeHand graphics objects are placed in PageMaker typesetting, there will be three designations for the same color, and three plates will be produced when the color separation output, resulting in output errors.

所以，假如数据文件需求在两种以上的软件中运用，在整合后的分色输出前，一定要留意：必需统一相同专色的运用称号。较为常用的办法是紧发排软件中的颜色称号为准，将相同专色的称号在各类软件的调色板中重新命名为统一的称号。

Therefore, if the data file needs to be used in more than two kinds of software, before the integrated color separation output, we must pay attention to the need to unify the use of the same spot color title. The commonly used method is that the color titles in the tightening arrangement software are accurate, and the same spot color titles are renamed as unified titles in the palettes of various software.

2   专色加网的角度。

2. The angle of spot color screening.

普通状况下专色都以实式印刷，很少做网点处置，所以普通很少提到专色加网的角度。但当运用套色的浅网色时，就会存在对专色网点加网角度的设计和修正问题。假使有网点的专色跟随其他网点印刷的颜色有叠印区域，就必需思索专色加网的角度问题。

In general, spot color is printed in solid central mode, and seldom dot disposal, so the angle of spot color screening is seldom mentioned. But when using the light screen color of the set color, there will be problems in designing and modifying the angle of dot screening. If the spot color with dots follows the color of other dots and has overlay area, it is necessary to consider the angle of spot color screening.

此时，假如专色网点的加网角度与其他颜色加网角度构成的夹角小于30度，会呈现撞网产生龟纹；假如角度互相堆叠，则会招致油墨叠印问题，这些都将形成印刷品颜色的严重失真。

At this time, if the angle between the dot screen angle and the other color screen angle is less than 30 degrees, it will appear to bump into the screen and produce tortoise lines; if the angle stacks with each other, it will cause the problem of ink overlay, which will form a serious distortion of the color of printed matter.

另外，专色的加网角度在软件中普通都会预设为45度（45度均被以为是人眼感知舒适的角度，让网点排列在与程度和垂直线成相等角度的方向上能够减少人眼对网点的发觉才能，）若是一个双色彩影像或是数据文件中既有印刷四色黑成外（普通在四色加网印刷中，将黑网点放在45度，黄为0度、品红为15度、青为75度，）又有专色，或者是有两个以上专色，则在分色加网时都会以45度输出，所以在对专色运用浅网时，假如有可能与其他加网颜色有叠印，则必需在分色输出时开启软件颜色设定或打印设定的对话框，对专色加网角度停止修正。

In addition, the dot screening angle is usually set to 45 degrees in software (45 degrees are considered to be the most comfortable angle for the human eye to perceive, so that the dots are arranged in the same direction as the degree and vertical line can reduce the human eye's ability to detect dots). If there is printing in a two-color image or data file. Four-color screen printing (usually in four-color screen printing, the black dots are placed at 45 degrees, yellow is 0 degrees, magenta is 15 degrees, green is 75 degrees), there are spot colors, or there are more than two spot colors, in the color separation screen will be 45 degrees output, so in the use of light screen for spot color, if it is possible to overlap with other screen colors. The dialog box of software color setting or printing setting must be opened when the color separation output, and the correction of spot color screening angle must be stopped.