Copy Types, Continued
Continuous tone copy is material in which graduations of tone occur in an
uninterrupted flow. This type of copy includes original photographs, wash
drawings, oil paintings, pencil and poster drawings, and airbrush work.
Continuous tone copy must be converted into a halftone before printing.
Traditional continuous tone copy requires the extra step of exposure through
a special screen to produce a halftone. In digital duplication, a computer
using a process called dithering produces halftones cells.
Figure 1-5 shows an example of continuous tone copy. Imagine this
illustration without the halftone dot pattern required to reproduce the
illustration in this book.
Figure 1-5. Continuous tone copy.
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