Raster Images And Vector Images - Xerox Fiery color server User Manual

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When using color text, keep in mind that small font sizes typically do not print in
color with the same sharpness as in black. In most applications, black text prints
exclusively in black toner, while color text usually prints with two or more toners.
Any misregistration between the different toners on paper causes color text to lose
definition. You can make test prints to find the smallest point size at which color text
prints clearly. When using high-end graphics applications that allow you to specify
color as percentages of cyan, magenta, yellow, and black, you can create pure cyan or
pure magenta text that prints with the same sharpness as black text. (Pure yellow text is
extremely hard to read on anything but a dark or complementary background.)

Raster images and vector images

Two broad categories of artwork can be printed from a personal computer to a color
printer: raster and vector images.
A raster image, also referred to as a bitmap, is composed of a grid of pixels, each
assigned a particular color value (as shown in example a in the following figure). The
grid, when sufficiently enlarged, resembles a mosaic made from square tiles. Examples
of raster images include scans and images created in painting or pixel-editing
applications, such as Photoshop and Corel Painter.
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