private static void TestCieXYZToLab(float x, float y, float z, float expectedL, float expectedA, float expectedB)
{
float l, a, b;
CieLabUtils.CieXYZToLab(x, y, z, out l, out a, out b);
Assert.That(l, Is.EqualTo(expectedL).Within(Epsilon));
Assert.That(a, Is.EqualTo(expectedA).Within(Epsilon));
Assert.That(b, Is.EqualTo(expectedB).Within(Epsilon));
}
private static void TestLabToCieXYZ(float l, float a, float b, float expectedX, float expectedY, float expectedZ)
{
float x, y, z;
CieLabUtils.LabToCieXYZ(l, a, b, out x, out y, out z);
Assert.That(x, Is.EqualTo(expectedX).Within(Epsilon));
Assert.That(y, Is.EqualTo(expectedY).Within(Epsilon));
Assert.That(z, Is.EqualTo(expectedZ).Within(Epsilon));
}
public void LabToCieXYZ_is_inverse_of_CieXYZToLab()
{
for (float x = 0; x <= 0.95047f; x += Step)
{
for (float y = Step; y <= 1.0f; y += Step)
{
for (float z = 0; z <= 1.08883; z += Step)
{
float l, a, b;
CieLabUtils.CieXYZToLab(x, y, z, out l, out a, out b);
TestLabToCieXYZ(l, a, b, x, y, z);
}
}
}
}
public static void LChToCieXYZ(
float l, float c, float h,
out float x, out float y, out float z,
LxyModel model = LxyModel.Lab, float[] referenceWhiteXyz = null)
{
float lxy_l, lxy_x, lxy_y;
LChToLxy(l, c, h, out lxy_l, out lxy_x, out lxy_y);
switch (model)
{
case LxyModel.Lab:
CieLabUtils.LabToCieXYZ(lxy_l, lxy_x, lxy_y, out x, out y, out z, referenceWhiteXyz);
break;
case LxyModel.Luv:
CieLuvUtils.LuvToCieXYZ(lxy_l, lxy_x, lxy_y, out x, out y, out z, referenceWhiteXyz);
break;
default:
throw new ArgumentException("Illegal model!");
}
}
public static void CieXYZToLCh(
float x, float y, float z,
out float l, out float c, out float h,
LxyModel model = LxyModel.Lab, float[] referenceWhiteXyz = null)
{
float lxy_l, lxy_x, lxy_y;
switch (model)
{
case LxyModel.Lab:
CieLabUtils.CieXYZToLab(x, y, z, out lxy_l, out lxy_x, out lxy_y, referenceWhiteXyz);
break;
case LxyModel.Luv:
CieLuvUtils.CieXYZToLuv(x, y, z, out lxy_l, out lxy_x, out lxy_y, referenceWhiteXyz);
break;
default:
throw new ArgumentException("Illegal model!");
}
LxyToLCh(lxy_l, lxy_x, lxy_y, out l, out c, out h);
}