这是我的实现：
import java.awt.color.ColorSpace;public class CIELab extends ColorSpace { public static CIELab getInstance() { return Holder.INSTANCE; } @Override public float[] fromCIEXYZ(float[] colorvalue) { double l = f(colorvalue[1]); double L = 116.0 * l - 16.0; double a = 500.0 * (f(colorvalue[0]) - l); double b = 200.0 * (l - f(colorvalue[2])); return new float[] {(float) L, (float) a, (float) b}; } @Override public float[] fromRGB(float[] rgbvalue) { float[] xyz = CIEXYZ.fromRGB(rgbvalue); return fromCIEXYZ(xyz); } @Override public float getMaxValue(int component) { return 128f; } @Override public float getMinValue(int component) { return (component == 0)? 0f: -128f; } @Override public String getName(int idx) { return String.valueOf("Lab".charAt(idx)); } @Override public float[] toCIEXYZ(float[] colorvalue) { double i = (colorvalue[0] + 16.0) * (1.0 / 116.0); double X = fInv(i + colorvalue[1] * (1.0 / 500.0)); double Y = fInv(i); double Z = fInv(i - colorvalue[2] * (1.0 / 200.0)); return new float[] {(float) X, (float) Y, (float) Z}; } @Override public float[] toRGB(float[] colorvalue) { float[] xyz = toCIEXYZ(colorvalue); return CIEXYZ.toRGB(xyz); } CIELab() { super(ColorSpace.TYPE_Lab, 3); } private static double f(double x) { if (x > 216.0 / 24389.0) { return Math.cbrt(x); } else { return (841.0 / 108.0) * x + N; } } private static double fInv(double x) { if (x > 6.0 / 29.0) { return x*x*x; } else { return (108.0 / 841.0) * (x - N); } } private Object readResolve() { return getInstance(); } private static class Holder { static final CIELab INSTANCE = new CIELab(); } private static final long serialVersionUID = 5027741380892134289L; private static final ColorSpace CIEXYZ = ColorSpace.getInstance(ColorSpace.CS_CIEXYZ); private static final double N = 4.0 / 29.0;}
