HALFTONE(6D)HALFTONE(6D)NAMEhalftone - half-tone an image
SYNOPSIShalftone inimage outimage freq angle [patternno]
DESCRIPTIONhalftone converts the input image into a halftoned image, using
Hollaway's technique. The density of the halftone screen is controlled
by the floating point value freq. Smaller values of "freq" make a larger
dot pattern. The angle of the halftone patterns is controlled by the
argument "angle". The integer argument "patternno" selects the halftone
pattern. 0 is the default and creates a dot pattern. A pattern value of
1 will create a line screen, while 2, 3, 4, and 5 create other halftone
patterns.
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