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@ -17,6 +17,7 @@ local KoboSysfsLight = {
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white_offset = -25,
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red_offset = 0,
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green_offset = -65,
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exponent = 0.25,
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}
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function KoboSysfsLight:new(o)
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@ -61,14 +62,14 @@ function KoboSysfsLight:setNaturalBrightness(brightness, warmth)
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if brightness > 0 then
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-- On Nickel, the values for white/red/green are roughly linearly dependent
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-- on the 4th root of brightness and warmth.
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white = math.min(self.white_gain * math.pow(brightness, 0.25) *
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math.pow(100 - warmth, 0.25) + self.white_offset, 255)
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white = math.min(self.white_gain * math.pow(brightness, self.exponent) *
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math.pow(100 - warmth, self.exponent) + self.white_offset, 255)
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end
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if warmth > 0 then
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red = math.min(self.red_gain * math.pow(brightness, 0.25) *
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math.pow(warmth, 0.25) + self.red_offset, 255)
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green = math.min(self.green_gain * math.pow(brightness, 0.25) *
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math.pow(warmth, 0.25) + self.green_offset, 255)
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red = math.min(self.red_gain * math.pow(brightness, self.exponent) *
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math.pow(warmth, self.exponent) + self.red_offset, 255)
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green = math.min(self.green_gain * math.pow(brightness, self.exponent) *
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math.pow(warmth, self.exponent) + self.green_offset, 255)
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end
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white = math.max(white, 0)
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