Creates a CMYK colour object from fractional values 0..1.
Color::CMYK.from_fraction(0.3, 0, 0.8, 0.3)
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# File 'lib/color/cmyk.rb', line 22 def from_fraction(c = 0, m = 0, y = 0, k = 0, &block) new(c, m, y, k, 1.0, &block) end