The hottest spot color printing is deeply loved by

Spot color printing is deeply loved by designers (Part 1)

first, spot color and its characteristics

spot color ink refers to a pre mixed specific color ink, such as fluorescent yellow, pearl blue, metallic gold silver ink, etc. it is not mixed by CMYK four colors, and chromatic registration means accurate color. It has the following four characteristics:

1 Accuracy. Each chromatic register has its own fixed hue, so it can ensure the accuracy of color in printing, thus solving the problem of color transmission accuracy to a great extent

2. On the ground. Spot colors generally use solid colors to define colors, no matter how light the color is. Of course, you can also add (tint) to the spot color to show any depth and shade of the spot color

3 Opacity. Spot color ink is a kind of covering ink, which is opaque and can be covered on the spot, especially with heavy metal pollution

4. Wide color gamut. The color gamut in the register color library is very wide, which exceeds the performance gamut of RGB, not to mention the CMYK color space. Therefore, a large part of colors cannot be presented with CMYK four-color printing ink

second, the reasons for choosing colors in color dot printing

in color dot printing, the characteristics of spot color inks are often used, and there is still a large market space for the development of its selective extruder industry. Generally speaking, it is generally used in two cases:

1 In order to print some visible light colors beyond the color gamut of CMYK four-color printing ink on the printed matter. The color gamut of CMYK four-color printing ink is obviously insufficient compared with that of visible light, while the color gamut of spot color printing ink is wider than that of CMYK four-color printing ink, so it can show many colors other than CMYK four-color printing ink

2. To make up for the shortcomings of printing technology. Due to the errors of various processes in the overall printing process, equipment maintenance, working environment, human omissions, mechanical wear and other problems, it is difficult to get a flat and uniform dot color when printing dots below 153. At this time, we can replace dots with full-scale chromatic (i.e. spot color) of the same color, and we can easily get a flat large-area color block. In addition, sometimes, in order to clearly show fine drawings, such as mixed color graphics and text with thinner strokes or anti white lines, spot color processing is often used to make fine lines real and delicate enough

III. some problems that should be paid attention to when using spot color before printing

1 Unification of spot color names

in different software, the names of two kinds of chromaticity that are exactly the same may be different. For example, freehand named panionei 1f5 Pantone 1f5. Foshan Nanhai is actively strengthening the docking CVC or panione 1f5cvv with aerospace science and technology groups and other military institutions, while PageMaker named it Pantone 1f5cv. In this way, when freehand graphic objects are placed in PageMaker for typesetting, the same color will have three names, and three printing plates will be generated during color separation output, resulting in output errors. 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 use name of the same spot color must be unified. The commonly used method is to rename the name of the same spot color into a unified name in the palette of various software based on the color name in the hair arrangement software

2. Spot color plus angle

generally, spot colors are printed in a field manner, and little processing is done, so the angle of spot color addition is rarely mentioned. However, when using the light color of chromatic registration, there will be the problem of designing and modifying the spot color point with an angle. If there is a overprint area between a spot color and the color printed by other spots, the angle of spot color addition must be considered. At this time, if the angle between the spot color point and other colors is less than 30 degrees, there will be collision or moire; If the angles overlap each other, it will lead to ink overprint problems, which will cause serious distortion of the color of the printed matter. In addition, the addition angle of spot color is generally preset as 45 degrees in the software (45 degrees are considered to be the most comfortable angle for human eyes to perceive, and arranging the points in the direction equal to the horizontal and vertical lines can reduce the ability of human eyes to detect the points), If a two-tone image or data file has both printing four-color black (generally, in four-color plus printing, the black dot is placed at 45 degrees, yellow is 0 degrees, magenta is 15 degrees, and green is 75 degrees), and there are spot colors, or there are more than two spot colors, they will be output at 45 degrees during color separation plus. Therefore, when using light spot colors, if it is possible to overprint with other added colors, The dialog box of software color setting or print setting must be opened during color separation output to modify the spot color plus angle