Black, gold and other special traps
Black, gold, silver and other special traps generally follow the following rules.
1. When the black and gold blocks are adjacent to other colors, other colors are darkened and the gold blocks are enlarged, and can be expanded to 0.5-1 mm.
2. Generally black and gold text is superimposed directly on the background.
3. Patterns with black and gold contour lines, pattern fill color and adjacent background color are best stacked in the middle of black and gold lines to avoid trapping unevenness.
4. Under normal circumstances, relatively small black and gold blocks can be directly superimposed on the background color; larger black and gold blocks need to be overprinted with the background color in order to save ink, and the background color can be extended into black and gold blocks.
5. Although the hiding power of black and gold ink is strong, it also has a certain degree of transparency. When large black and gold blocks are stacked on two different colors, black, gold and background colors are used to ensure a consistent visual color effect. Should use overprinting.
6. When the black and gold blocks are directly overprinted on the background, and there are white characters or thin lines on them, if the area of ​​the black and gold blocks is large, the black and gold blocks and the background color should be overprinted if the area is relatively small. Small, white text or thin lines can also be reduced to avoid the white, white lines after printing.
7. When black is adjacent to gold or silver, trapping can be performed according to the printed color sequence. Under normal circumstances, black can be overprinted in gold or silver. If the area is large, it is best to make overprints to avoid printing difficulties.
White trapping
In plastic packaging printing, white ink applications are quite extensive. Generally, in the printing of transparent or translucent plastic, it is necessary to make the bottom in white, and sometimes also to hold two layers of white. In order to prevent the white underneath the excellent block from being exposed due to overprinting, a white retraction should be considered before printing.
1. The white retraction can be performed according to the depth of the color or the customer's request. The retraction amount is generally 0.2-0.3mm.
2. If the color block is white and the side is transparent, white can be retracted to 0.3 mm.
3. Black and gold under the care of the white, the white can be retracted to black, gold 0.5-1mm.
4. If the color of the color block is light or flat, the amount of white retraction should be small or not retracted. For example, when the percentage of the dot of the color patch is between 30% and 50%, the amount of white retraction may be 0.15 mm; and when the percentage of the dot of the color patch is less than 30%, the white may not be retracted.
5. When whitening under the gradient pattern, white should be considered for oblique retraction. Under the cyan gradient, the color is white, and the cyan is dark where the white color shrinks by 0.2 mm, and the cyan color is where the white color shrinks by 0.1 mm. The inflection point shift method can be used now.
6. If the transparent color (under the ink is not white) is adjacent to other colors, the white color under other colors should be 0.2mm; if the transparent color is directly adjacent to the white, the white color should be extended to 0.2mm to the transparent color to avoid leaks. .
Trapping of common software
In common packaging design software, trapping can be performed manually or automatically.
1. Trapping of the base vector
Lllustrator and FreeHand are vector-based graphics processing software. They can generate simple automatic trapping objects, and the functions of auto trapping are basically the same. They create a single light-colored overprinting pad to cover adjacent color blocks. They can determine when traps need to be trapped between adjacent color patches, when they do not need to be trapped, and trap only selected objects.
Open the Trapping tool panel in the PathFinder command under the Window menu in the lllustrator software; call the Trapping panel in the FreeHand software's External Function\Create\Trap. The options described here are as follows.
Width (lllustrator/FreeHand): The width of the trapping area. The default value in lllustrator is 0.25 points and the range is 0.01-5000 points; in FreeHand you can enter the unit, such as 0.2mm.
Color reduction (lllustrator/FreeHand): This is to reduce the proportion of bright colors in the trapping area so as to reduce the discoloration in the trapping area. The default value is 40%.
Reversed trapping (lllustrator/FreeHand): Changes the trapping direction so that the dark color expands into the bright color area.
Automatic trapping in the lllustrator and FreeHand software can only handle traps between adjacent fill patches, and trapping of fill patches and patterns of strokes, gradients, continuous images, and other features cannot be trapped.
The lllustrator and FreeHand software automatically traps based on the brightness of the color. The trapping rules are as follows.
(1) All colors expand into black.
(2) Bright color expands into dark colors (including spot colors and other colors).
(3) The arrangement of the primary colors' brightness is from dark to light: M, C, and 丫. That is, when the magenta filling is adjacent to the cyan filling, the cyan is extended to the magenta, and this is in accordance with the order of K, C, M, and 丫 printing colors. The trapping method of the time is just the opposite. This is the place to pay attention to.
2. Trapping processing of base sub-bitmap
Trapping in Photoshop is done under the trapping command in the software's "Image" menu. It has only an option for trap width.
Photoshop software traps only by enlarging colors. The trapping rules are as follows.
(1) All colors expand toward black.
(2) Bright color expands to dark colors.
(3) The yellow color expands toward magenta and cyan.
(4) The expansion of cyan and magenta peering, ie, mutual expansion.
Also need to pay attention to the following matters.
(1) Consecutive tone images do not require trapping themselves.
(2) The pattern can only be used with the trapping tool when pressing the platform layer.
(3) When the color patch and the color patch are trapped, there will be a fracture at the corner.
Professional trapping software
Professional trapping software is a powerful tool for solving trapping problems. Currently, many RIPs provide inrip trapping, which is an open trapping function in RIP. However, this type of trapping method sometimes cannot achieve satisfactory trapping effect, nor can it be manually modified; trapping with RIP is often an unpleasant experience if design drafts require more or more trapping. The waiting process.
There are also some professional packaging design software such as PACKEDGE, ARTPRO and other powerful trapping modules, but these trapping functions can only be used in their own software systems. Users must also purchase software and trap modules at the same time. Can use trapping features. At present, these softwares have not reached the level of popularity with respect to the sub-general design and pre-press publishing workers.
Now, Esko-Graphics has launched a new DeskPack software, which mainly solves the problems existing in trapping.
First of all, DeskPack provides plug-ins embedded in tlllustrator. Traps can be trapped directly in the lllustrator software and its trapping function (TrapX) is very powerful.
1. It utilizes the latest brightness-based trapping engine, ColorStitch, to quickly and accurately handle trapping in all packaging designs. All trapping needs to be done quickly with just one command.
2. Ability to deal with graphics, text, special fills, gradients, and trapping between images, especially when dealing with gradients and trapping between adjacent patches. Gravity can be easily trapped to avoid trapping too hard.
3. Separately generated trapping layer, users can be flexible. It is highly interactive to easily edit and modify trapping content while leaving the original file intact. Humanized trapping tools.
4. Trapping parameters can be set and controlled according to the printing process.
5. The trapping of a manuscript is generally completed within a few minutes by the Trap command. If a partial correction is made, the update is generally completed within a few seconds.
Secondly, DeskPack software is for the majority of the lllustrator users. The ordinary prepress staff can master all the functions of the software in only one day. Easy to learn and use is another characteristic of it.
Black, gold, silver and other special traps generally follow the following rules.
1. When the black and gold blocks are adjacent to other colors, other colors are darkened and the gold blocks are enlarged, and can be expanded to 0.5-1 mm.
2. Generally black and gold text is superimposed directly on the background.
3. Patterns with black and gold contour lines, pattern fill color and adjacent background color are best stacked in the middle of black and gold lines to avoid trapping unevenness.
4. Under normal circumstances, relatively small black and gold blocks can be directly superimposed on the background color; larger black and gold blocks need to be overprinted with the background color in order to save ink, and the background color can be extended into black and gold blocks.
5. Although the hiding power of black and gold ink is strong, it also has a certain degree of transparency. When large black and gold blocks are stacked on two different colors, black, gold and background colors are used to ensure a consistent visual color effect. Should use overprinting.
6. When the black and gold blocks are directly overprinted on the background, and there are white characters or thin lines on them, if the area of ​​the black and gold blocks is large, the black and gold blocks and the background color should be overprinted if the area is relatively small. Small, white text or thin lines can also be reduced to avoid the white, white lines after printing.
7. When black is adjacent to gold or silver, trapping can be performed according to the printed color sequence. Under normal circumstances, black can be overprinted in gold or silver. If the area is large, it is best to make overprints to avoid printing difficulties.
White trapping
In plastic packaging printing, white ink applications are quite extensive. Generally, in the printing of transparent or translucent plastic, it is necessary to make the bottom in white, and sometimes also to hold two layers of white. In order to prevent the white underneath the excellent block from being exposed due to overprinting, a white retraction should be considered before printing.
1. The white retraction can be performed according to the depth of the color or the customer's request. The retraction amount is generally 0.2-0.3mm.
2. If the color block is white and the side is transparent, white can be retracted to 0.3 mm.
3. Black and gold under the care of the white, the white can be retracted to black, gold 0.5-1mm.
4. If the color of the color block is light or flat, the amount of white retraction should be small or not retracted. For example, when the percentage of the dot of the color patch is between 30% and 50%, the amount of white retraction may be 0.15 mm; and when the percentage of the dot of the color patch is less than 30%, the white may not be retracted.
5. When whitening under the gradient pattern, white should be considered for oblique retraction. Under the cyan gradient, the color is white, and the cyan is dark where the white color shrinks by 0.2 mm, and the cyan color is where the white color shrinks by 0.1 mm. The inflection point shift method can be used now.
6. If the transparent color (under the ink is not white) is adjacent to other colors, the white color under other colors should be 0.2mm; if the transparent color is directly adjacent to the white, the white color should be extended to 0.2mm to the transparent color to avoid leaks. .
Trapping of common software
In common packaging design software, trapping can be performed manually or automatically.
1. Trapping of the base vector
Lllustrator and FreeHand are vector-based graphics processing software. They can generate simple automatic trapping objects, and the functions of auto trapping are basically the same. They create a single light-colored overprinting pad to cover adjacent color blocks. They can determine when traps need to be trapped between adjacent color patches, when they do not need to be trapped, and trap only selected objects.
Open the Trapping tool panel in the PathFinder command under the Window menu in the lllustrator software; call the Trapping panel in the FreeHand software's External Function\Create\Trap. The options described here are as follows.
Width (lllustrator/FreeHand): The width of the trapping area. The default value in lllustrator is 0.25 points and the range is 0.01-5000 points; in FreeHand you can enter the unit, such as 0.2mm.
Color reduction (lllustrator/FreeHand): This is to reduce the proportion of bright colors in the trapping area so as to reduce the discoloration in the trapping area. The default value is 40%.
Reversed trapping (lllustrator/FreeHand): Changes the trapping direction so that the dark color expands into the bright color area.
Automatic trapping in the lllustrator and FreeHand software can only handle traps between adjacent fill patches, and trapping of fill patches and patterns of strokes, gradients, continuous images, and other features cannot be trapped.
The lllustrator and FreeHand software automatically traps based on the brightness of the color. The trapping rules are as follows.
(1) All colors expand into black.
(2) Bright color expands into dark colors (including spot colors and other colors).
(3) The arrangement of the primary colors' brightness is from dark to light: M, C, and 丫. That is, when the magenta filling is adjacent to the cyan filling, the cyan is extended to the magenta, and this is in accordance with the order of K, C, M, and 丫 printing colors. The trapping method of the time is just the opposite. This is the place to pay attention to.
2. Trapping processing of base sub-bitmap
Trapping in Photoshop is done under the trapping command in the software's "Image" menu. It has only an option for trap width.
Photoshop software traps only by enlarging colors. The trapping rules are as follows.
(1) All colors expand toward black.
(2) Bright color expands to dark colors.
(3) The yellow color expands toward magenta and cyan.
(4) The expansion of cyan and magenta peering, ie, mutual expansion.
Also need to pay attention to the following matters.
(1) Consecutive tone images do not require trapping themselves.
(2) The pattern can only be used with the trapping tool when pressing the platform layer.
(3) When the color patch and the color patch are trapped, there will be a fracture at the corner.
Professional trapping software
Professional trapping software is a powerful tool for solving trapping problems. Currently, many RIPs provide inrip trapping, which is an open trapping function in RIP. However, this type of trapping method sometimes cannot achieve satisfactory trapping effect, nor can it be manually modified; trapping with RIP is often an unpleasant experience if design drafts require more or more trapping. The waiting process.
There are also some professional packaging design software such as PACKEDGE, ARTPRO and other powerful trapping modules, but these trapping functions can only be used in their own software systems. Users must also purchase software and trap modules at the same time. Can use trapping features. At present, these softwares have not reached the level of popularity with respect to the sub-general design and pre-press publishing workers.
Now, Esko-Graphics has launched a new DeskPack software, which mainly solves the problems existing in trapping.
First of all, DeskPack provides plug-ins embedded in tlllustrator. Traps can be trapped directly in the lllustrator software and its trapping function (TrapX) is very powerful.
1. It utilizes the latest brightness-based trapping engine, ColorStitch, to quickly and accurately handle trapping in all packaging designs. All trapping needs to be done quickly with just one command.
2. Ability to deal with graphics, text, special fills, gradients, and trapping between images, especially when dealing with gradients and trapping between adjacent patches. Gravity can be easily trapped to avoid trapping too hard.
3. Separately generated trapping layer, users can be flexible. It is highly interactive to easily edit and modify trapping content while leaving the original file intact. Humanized trapping tools.
4. Trapping parameters can be set and controlled according to the printing process.
5. The trapping of a manuscript is generally completed within a few minutes by the Trap command. If a partial correction is made, the update is generally completed within a few seconds.
Secondly, DeskPack software is for the majority of the lllustrator users. The ordinary prepress staff can master all the functions of the software in only one day. Easy to learn and use is another characteristic of it.
Source: Henan Graphic Arts
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