GRA 424 Study Guide - Midterm Guide: Dot Gain, Densitometer, Offset Printing
22 Jul 2014
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Ink trapping: the ratio of a 2nd down ink film onto a previously printed ink film relative to the 2nd down ink film on paper. In offset lithography, the thickness is 3-5 um (microns) Intended for coated paper: cielab - numeric definition of human vision, l lightness/darkness, a red/green, b yellow/blue, negative = cool colour, positive = warm colour, delta e = cie lab error: Gracol general requirements and applications for commercial offset lithography. Print standards: printing is no longer an artform, it"s a manufacturing process (only effictient when standardized) G7: grayscale for 7 iso ink solids (cmykrgb) Idealliance trademark: new method of calibrating press or proofer to produce constant neutral gray scale, basis on sop11, gracol 7, based on visual metrics, logical use of top curves than adjusting tvi. Responsibility for quality: responsibility is delegated to arious areas (sales, prepress, pressroom, bindery etc: everyone is responsible, authority to make quality decisions must accompany responsibility, accountability measurement system.
