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halftone - half-tone an image
halftone inimage outimage freq
angle [patternno]
halftone 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 [lq]freq[rq]
make a larger dot pattern. The angle of the halftone patterns is controlled
by the argument [lq]angle[rq]. The integer argument [lq]patternno[rq] 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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