Four-colour process screens

halftone_cmyk() separates an RGB field (from halftone_raster()) into cyan, magenta, yellow and black tone fields; geom_halftone_cmyk() returns the four geom_halftone() layers at the classic screen angles (C 15, M 75, Y 0, K 45) in process inks.

Usage

halftone_cmyk(field)

geom_halftone_cmyk(field, pitch = 1, levels = 6, alpha = 0.85, ...)

Arguments

field

A field with r, g, b columns in [0, 1].

pitch, levels, alpha, ...

Passed to geom_halftone().

Value

A list of four fields, or a list of four layers to add to a plot.