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优化
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@ -15,7 +15,6 @@ object ColorUtils {
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return String.format("#%06X", 0xFFFFFF and intColor)
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}
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fun stripAlpha(@ColorInt color: Int): Int {
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return -0x1000000 or color
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}
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@ -176,72 +175,19 @@ object ColorUtils {
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+ (colorByteArr[2].toInt() and 0xFF shl 8) + (colorByteArr[3].toInt() and 0xFF))
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}
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fun rgb2lab(R: Int, G: Int, B: Int): IntArray {
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val x: Float
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val y: Float
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val z: Float
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val fx: Float
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val fy: Float
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val fz: Float
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val xr: Float
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val yr: Float
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val zr: Float
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val eps = 216f / 24389f
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val k = 24389f / 27f
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val xr1 = 0.964221f // reference white D50
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val yr1 = 1.0f
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val zr1 = 0.825211f
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// RGB to XYZ
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var r: Float = R / 255f //R 0..1
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var g: Float = G / 255f //G 0..1
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var b: Float = B / 255f //B 0..1
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// assuming sRGB (D65)
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r = if (r <= 0.04045) r / 12 else ((r + 0.055) / 1.055).pow(2.4).toFloat()
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g = if (g <= 0.04045) g / 12 else ((g + 0.055) / 1.055).pow(2.4).toFloat()
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b = if (b <= 0.04045) b / 12 else ((b + 0.055) / 1.055).pow(2.4).toFloat()
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x = 0.436052025f * r + 0.385081593f * g + 0.143087414f * b
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y = 0.222491598f * r + 0.71688606f * g + 0.060621486f * b
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z = 0.013929122f * r + 0.097097002f * g + 0.71418547f * b
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// XYZ to Lab
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xr = x / xr1
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yr = y / yr1
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zr = z / zr1
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fx = if (xr > eps) xr.toDouble().pow(1 / 3.0)
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.toFloat() else ((k * xr + 16.0) / 116.0).toFloat()
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fy = if (yr > eps) yr.toDouble().pow(1 / 3.0)
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.toFloat() else ((k * yr + 16.0) / 116.0).toFloat()
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fz = if (zr > eps) zr.toDouble().pow(1 / 3.0)
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.toFloat() else ((k * zr + 16.0) / 116).toFloat()
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val ls: Float = 116 * fy - 16
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val `as`: Float = 500 * (fx - fy)
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val bs: Float = 200 * (fy - fz)
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val lab = IntArray(3)
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lab[0] = (2.55 * ls + .5).toInt()
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lab[1] = (`as` + .5).toInt()
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lab[2] = (bs + .5).toInt()
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return lab
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}
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/**
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* Computes the difference between two RGB colors by converting them to the L*a*b scale and
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* comparing them using the CIE76 algorithm { http://en.wikipedia.org/wiki/Color_difference#CIE76}
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*/
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fun getColorDifference(a: Int, b: Int): Double {
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val r1: Int = Color.red(a)
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val g1: Int = Color.green(a)
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val b1: Int = Color.blue(a)
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val r2: Int = Color.red(b)
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val g2: Int = Color.green(b)
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val b2: Int = Color.blue(b)
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val lab1 = rgb2lab(r1, g1, b1)
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val lab2 = rgb2lab(r2, g2, b2)
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val lab1 = DoubleArray(3)
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val lab2 = DoubleArray(3)
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ColorUtils.colorToLAB(a, lab1)
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ColorUtils.colorToLAB(b, lab2)
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return sqrt(
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(lab2[0] - lab1[0].toDouble())
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.pow(2.0) + (lab2[1] - lab1[1].toDouble())
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.pow(2.0) + (lab2[2] - lab1[2].toDouble())
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(lab2[0] - lab1[0])
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.pow(2.0) + (lab2[1] - lab1[1])
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.pow(2.0) + (lab2[2] - lab1[2])
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.pow(2.0)
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)
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}
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