Module: ColorContrastCalc::Converter::Grayscale

Defined in:: lib/color_contrast_calc/converter.rb

Class Method Summary collapse

.calc_rgb(rgb, s) ⇒ Array<Integer>

Convert a passed color to grayscale.

Class Method Details

.calc_rgb(rgb, s) ⇒ `Array<Integer>`

Convert a passed color to grayscale.

The calculation is based on the definition found at www.w3.org/TR/filter-effects/#funcdef-grayscale www.w3.org/TR/filter-effects/#grayscaleEquivalent www.w3.org/TR/SVG/filters.html#feColorMatrixElement

Parameters:

rgb (Array<Integer>) —

The Original RGB value before the conversion
s (Float) —

Conversion ratio in percentage

Returns:

(Array<Integer>) —

RGB value of grayscale color



231
232
233

# File 'lib/color_contrast_calc/converter.rb', line 231

def self.calc_rgb(rgb, s)
  Converter.rgb_map((calc_grayscale(s) * Vector[*rgb]).to_a)
end