Class: ColorDiff::Color::Xyz

Inherits:
Object
  • Object
show all
Defined in:
lib/color_diff/color/xyz.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(x = 0, y = 0, z = 0) ⇒ Xyz 



6
7
8
9
10
 
# File 'lib/color_diff/color/xyz.rb', line 6

def initialize(x = 0, y = 0, z = 0)
  @x = x
  @y = y
  @z = z
end

Instance Attribute Details

#x ⇒ Object (readonly)

Returns the value of attribute x.



4
5
6
 
# File 'lib/color_diff/color/xyz.rb', line 4

def x
  @x
end

#y ⇒ Object (readonly)

Returns the value of attribute y.



4
5
6
 
# File 'lib/color_diff/color/xyz.rb', line 4

def y
  @y
end

#z ⇒ Object (readonly)

Returns the value of attribute z.



4
5
6
 
# File 'lib/color_diff/color/xyz.rb', line 4

def z
  @z
end

Class Method Details

.from_rgb(rgb) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
 
# File 'lib/color_diff/color/xyz.rb', line 16

def self.from_rgb(rgb)
  r = normalize_rgb_component rgb.r
  g = normalize_rgb_component rgb.g
  b = normalize_rgb_component rgb.b

  x = r * 0.4124 + g * 0.3576 + b * 0.1805
  y = r * 0.2126 + g * 0.7152 + b * 0.0722
  z = r * 0.0193 + g * 0.1192 + b * 0.9505

  new(x, y, z)
end

.normalize_rgb_component(c) ⇒ Object 



28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/color_diff/color/xyz.rb', line 28

def self.normalize_rgb_component(c)
  c = c / 255.0

  if c > 0.04045
    c = ((c + 0.055) / 1.055) ** 2.4
  else
    c = c / 12.92
  end

  c * 100
end

Instance Method Details

#to_lab ⇒ Object 



12
13
14
 
# File 'lib/color_diff/color/xyz.rb', line 12

def to_lab
  Lab.from_xyz(self)
end