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Chapter 3

GCM 110 Chapter Notes - Chapter 3: Grayscale, Scalable Vector Graphics, Device Independence

Graphic Communications
Course Code
GCM 110
Diana Brown

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GCM 110:
p.59-63, 74-75, 79-80, 81-82, 92, 107-111
Kinds of Original Images
1. Line type matter, lines, diagrams, and pen and ink drawings
2. Continuous-tone photograph
-One colour (monochrome), multicolor, or process colour (CMYK)
-For reproduction, continuous-tone imageshalftones (dot pattern)
-Line screen: measure of how many halftone lines are printed in an inch (lpi)
-133 lpi or higher dots will blend into a continuous tone, cannot see individual dots
-lpi is dependent on the original output device and type of paper
Preparing Art
-Digits are the fundamental basis for digital imaging
-Materials destined for reproduction must be in the form of a digital file, and material that
is reproduced is done by spots, dots, and pixels
-Register: important when preparing art to print of 2 or more colours
-Special colours: logos cannot be reproduced by overprinting, and just use special color
inks (PMS- Pantone Matching System)
-Duotones: a two-color half-tone, used to create more depth and contrast in B&W photos
-A two-colour duotone effect is used by printing a screened tint of a color over a black
Scaling and Cropping
-Scaling: changing the size of the reproduction without changing the ratio of the
dimension Diagonal method of scaling
-Cropping: the process of trimming or cutting off parts of a picture
Digitizing Copy Preparation
-Art may be created in one of two forms: Analog or Digital
-All analog art must be converted into digital form for prepress and production
-Digital art: drawing programs vector/lined based and paint and imaging
-Art/images can be created on screen or they may be captured via scanners/digital cameras
and then manipulated on screen
-Scanners: takes a photographic print and uses a light source to light up every possible
spot on the image, recording the amount of light reflected and converts that information
into binary data to store the image data in a computer as a set of numbers
-Reflection and transmission:
Reflection copy: original material for reproduction that is viewed and
photographed by reflected light (ex: old books, oil paintings)
Transmission copy: viewed and photographed by transmitted light (ex: color
transparencies and color negatives)
-Digital cameras: combines cameras and scanners into one device
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