GCM 111 Lecture Notes - Lecture 7: Halftone, Cyan, Dot Gain
5 Feb 2018
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Document Summary
The world we live in is analog, and this includes colour. Our eyes see in continuous tone colour. A photograph shot by a film camera is continuous tone. A painting or sketch is continuous tone. The visible spectrum is light is between 400 nm and 700 nm. When continuous tone images are captured by scanner or digital camera, they are no longer continuous tone. When images are printed, the continuous tone colour is defined by a finite number of printing dots. Printed images are known as halftone images. Halftones are images made up of varying sized dots equally spaced apart. It is varying dot size that gives the illusion of an area being lighter or darker. Tints have same-sized dots equally spaced apart, and are used to create variations on a colour. Tint is made through the spacing of 100% cyan dots with white space. They are affected by the line screen ruling of the final printed job.
