Class: ColorConverters::CmykConverter

Inherits:
BaseConverter show all
Defined in:
lib/color_converters/converters/cmyk_converter.rb

Constant Summary

Constants inherited from BaseConverter

BaseConverter::IMPORT_DP, BaseConverter::OUTPUT_DP

Instance Attribute Summary

Attributes inherited from BaseConverter

#original_value, #rgba

Class Method Summary collapse

Methods inherited from BaseConverter

#alpha, #cielab, #cielch, #cmyk, factory, #hex, #hsb, #hsl, #hsv, inherited, #initialize, #name, #oklab, #oklch, #rgb, #xyz

Constructor Details

This class inherits a constructor from ColorConverters::BaseConverter

Class Method Details

.bounds ⇒ Object 



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# File 'lib/color_converters/converters/cmyk_converter.rb', line 11

def self.bounds
  { c: [0.0, 100.0], m: [0.0, 100.0], y: [0.0, 100.0], k: [0.0, 100.0] }
end

.matches?(colour_input) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/color_converters/converters/cmyk_converter.rb', line 5

def self.matches?(colour_input)
  return false unless colour_input.is_a?(Hash)

  colour_input.keys - [:c, :m, :y, :k] == []
end

.rgb_to_cmyk(rgb_array_frac) ⇒ Object 



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# File 'lib/color_converters/converters/cmyk_converter.rb', line 45

def self.rgb_to_cmyk(rgb_array_frac)
  r, g, b = rgb_array_frac

  k = (1.0 - [r, g, b].max)
  k_frac = k == 1.0 ? 1.0 : 1.0 - k

  c = (1.0 - r - k) / k_frac
  m = (1.0 - g - k) / k_frac
  y = (1.0 - b - k) / k_frac

  c *= 100
  m *= 100
  y *= 100
  k *= 100

  [c, m, y, k]
end