Method: ColorLib::GrayScale#-

Defined in:
lib/color_lib/grayscale.rb

#-(other) ⇒ Object

Subtracts another colour to the current colour. The other colour will be converted to grayscale before subtraction. This conversion depends upon a #to_grayscale method on the other colour.

The subtraction is done using the grayscale accessor methods to ensure a valid colour in the result.



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# File 'lib/color_lib/grayscale.rb', line 190

def -(other)
  other = other.to_grayscale
  ng    = self.dup
  ng.g  -= other.g
  ng
end