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Trapping is also called trapping, which is to use computer software to solve the absolute alignment between the various colors of printing that is difficult to achieve in the actual printing production process, that is, to solve the problem of white edge or lace formed by inaccurate printing overprinting. There are many situations in which objects such as text, graphics, and images in printing overlap each other. The trapping process for these overlapping objects also has a variety of processing methods, and the emergence of multiple methods also makes trapping into prepress production. A more complicated process.
ApogeeX is a new digital workflow from Agfa. This article will analyze how different types of traps are processed in the digital workflow ApogeeX.
Black trap
Black is the most noticeable in color trapping, so black or dark overprinting is significantly more noticeable than other light colors. In ApogeeX, black is taken out separately for trapping, and this black is no longer purely black, but a redefined black, including black and other dark colors. When is a color considered black? ApogeeX specifies that when a dark print value of a dark color in the software is greater than or equal to the specified black print value and the density is greater than or equal to the specified black density value, the color is defined. It is black. By default, only black fade values are 100% and only colors with a density above 1.6 are considered black. When trapping black, be sure to apply a soft trap value. If black or dark is formed by overprinting several colors, no trapping is required.
Image trapping
By default, the image is not trapped, but if the image overlaps with the background color behind it, the image appears to be hollowed out at the corresponding position of the background color, and the image is the same size as the knockout. At this time, the image needs to be trapped. deal with. Image trapping is divided into four cases: center (centered), normal (normal), spread (extended), choke (inward). When the image trapping is set to normal, a lot of sawtooth appears at the edge of the image; if it is centered, the image and the foreground color expand each other; if it is expanded, the image expands to the background color; if it is indented, it is the background color direction image. Expansion.
Trapped corner shape
If there is a situation in the document as shown in the figure, the foreground and background colors have corners at the overlap, and when the corners are trapped, the brighter foreground is expanded outward and overlaps at the corners. The shape of the overlap has three definitions in the ApogeeX digitization process: square, circle, and triangle.
Multicolor trapping
The common trapping is for the overlap between two spot colors, but if there are 3 or more spot colors overlapping each other, the trapping area can be handled in ApogeeX in two ways: Stack and split. At the time of overlap, the trapped portions of the image are superimposed on each other to form a black dot, which is mainly used for packaging printing. The trapping portion is separated at the time of division, and is mainly used for commercial printing.
Gradient trapping
In the objects superimposed on each other, if the front object is a luminous word or a gradient bar, if the trapping process simply follows the principle of light color to dark color expansion, the situation as shown in the figure will appear. Since the yellow neutral gray density is brighter than the cyan neutral gray density, the yellow color expands toward the cyan at the front end of the gradient bar. The neutral gray density of magenta is darker than that of cyan neutral gray, so the cyan to magenta extends at the back end of the gradient bar. To avoid the jagged edges of the gradient, ApogeeX provides a special gradient trapping technique that changes the edges of the gradient by setting the gradient trap color limits to smooth the gradient edges.