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Lecture 7

GCM 111 Lecture 7: Halftones, Tints, Screening Part 1

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Ryerson University
Graphic Communications
GCM 111
Jason Nolan

GCM 111: Lec 7 Halftones, Tints, Screening: Part 1 Feb. 5 / 2018 Halftones 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 Under 400 nm is ultraviolet Over 700 nm is infrared When continuous tone images are captured by scanner or digital camera, they are no longer continuous tone Colour is defined by finite pixels When images are printed, the continuous tone colour is defined by a finite number of printing dots Printed images are known as halftone images Linework and Halftone 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 Tints are a variation of a halftone Tints have same-sized dots equally spaced apart, and are used to create variations on a colour E.g. 100% cyan vs. 30% cyan Tint is made through the spacing of 100% cyan dots with white space The remaining 70% is white space Considerations for Halftones and Tints They are affected by the line screen ruling of the final printed job Line screen ruling is the resolution of the final printed pattern. It is measured in lines per inch (lpi) Certain screen angle rules must be employed to avoid printing issues such as moir (need minimum of 30 degree angle)
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