19 lines
376 B
Ruby
19 lines
376 B
Ruby
class RGBColour
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def to_grayscale
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luminosity = Integer(0.2126*@red + 0.7152*@green + 0.0722*@blue)
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self.class.new(luminosity, luminosity, luminosity)
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end
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end
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class Pixmap
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def to_grayscale
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gray = self.class.new(@width, @height)
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@width.times do |x|
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@height.times do |y|
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gray[x,y] = self[x,y].to_grayscale
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end
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end
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gray
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end
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end
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