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A picture is worth a thousand words, but what the words are themselves are more so up to the designer/photographer, especially with context. Designers must include all of the components when either taking a photograph or inventing a unique illustrative image, but don’t assume that the photo will capture what’s needed to exist in…
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In trapping cases involving smaller type, the eye can easily register changes in the shape of dark objects. To avoid type appearing over bold, shrink(choke) the background.
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In a Spread, the above object gets “Knocked Out” of the object below it, & the above color is extended to cover the bottom color. In a Choke, the above abject gets “Knocked Out” of the object below it, & the background color is brought into the “Knocked Out” area to ensure proper trapping.
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Sometimes the resulting color from the overprinting of 2 colors is a desired effect, as 2 inks overlap to create a 3rd color. Trapping would prevent the appearance of a 3rd color.
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Through the printing process, paper can shift from 1 color unit to the next. Without any proper trapping, image shifting/misregistration will result.
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Select a color for the stroke that’s a mixture of the 2 initial colors. Below for a Cyan letter on top of a Magenta background, we use a stroke that is made up of 40% C & 100% M—notice we use more of the darker valued ink.
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Add a stroke to your object, then convert the stroke into a path: Object>Path>Outline Stroke—Outline Divide Fill the outlined stroke with a mix of 2 colors needing trapping. Use the pathfinder to subtract from the shape of your stroke.