GCM 260 Lecture Notes - Lecture 8: Overprinting, Adobe Indesign, Raster Image Processor
9 Apr 2020
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Document Summary
To understand the four instances of trapping. A method of adjusting areas where two distinct, adjacent colours meet so that press misregistration won"t cause white spaces . The lighter colour is always spread into the darker colour as either a spread or choke. Trapping must occur when colours touch or k/o from one another. In the printing industry there are two kinds of trapping: Amount of ink printing on top of another ink. This is a premedia issue where documents are trapped to compensate for colour to colour registration issues. Trapping provides a margin of error to reduce the likeliness of seeing this misregistration in the final product. There are four key trapping instances that can occur in a file: overprint. One colour prints on top of another colour. Especially small black type (would essentially overprint anyway) An exception to this rule is when an opaque ink is being printed overtop black. Then black is spread into opaque ink.
