Class: ASE::Color::CMYK

Inherits:
Object
  • Object
show all
Defined in:
lib/ase/color_modes/cmyk.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(c = 0, m = 0, y = 0, k = 0) ⇒ CMYK 



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# File 'lib/ase/color_modes/cmyk.rb', line 8

def initialize(c=0, m=0, y=0, k=0)
  @c = c
  @m = m
  @y = y
  @k = k
end

Instance Attribute Details

#c ⇒ Object

Returns the value of attribute c.



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# File 'lib/ase/color_modes/cmyk.rb', line 6

def c
  @c
end

#k ⇒ Object

Returns the value of attribute k.



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# File 'lib/ase/color_modes/cmyk.rb', line 6

def k
  @k
end

#m ⇒ Object

Returns the value of attribute m.



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# File 'lib/ase/color_modes/cmyk.rb', line 6

def m
  @m
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/ase/color_modes/cmyk.rb', line 6

def y
  @y
end

Instance Method Details

#read!(file) ⇒ Object 



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# File 'lib/ase/color_modes/cmyk.rb', line 15

def read!(file)
  @c, @m, @y, @k = 4.times.map do
    file.read(4).unpack('g')[0].round(4)
  end
end

#to_a ⇒ Object 



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# File 'lib/ase/color_modes/cmyk.rb', line 39

def to_a
  [@c, @m, @y, @k]
end

#to_rgb ⇒ Object 



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# File 'lib/ase/color_modes/cmyk.rb', line 26

def to_rgb
  r = (1 - (@c * (1 - @k) + @k)) * 255
  g = (1 - (@m * (1 - @k) + @k)) * 255
  b = (1 - (@y * (1 - @k) + @k)) * 255

  # Clamp
  r = [0, r, 255].sort[1].to_i
  g = [0, g, 255].sort[1].to_i
  b = [0, b, 255].sort[1].to_i

  RGB.new(r, g, b)
end

#write!(file) ⇒ Object 



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# File 'lib/ase/color_modes/cmyk.rb', line 21

def write!(file)
  file.write 'CMYK'
  to_a.each { |c| file.write [c].pack('g') }
end