com.pixelmed.utils

Class ColorUtilities

java.lang.Object

com.pixelmed.utils.ColorUtilities

public class ColorUtilities
extends java.lang.Object

Various static methods helpful for color conversions.

Method Summary

Modifier and Type	Method and Description
static float[]	getCIELabFromXYZ(float[] cieXYZ) Convert CIEXYZ to CIE 1976 L*, a*, b*.
static float[]	getCIELabPCSFromIntegerScaledCIELabPCS(int[] cieLabScaled) Convert 16 bit fractional integer scaled CIELab values used in ICC profiles and DICOM to floating point.
static float[]	getCIELabPCSFromSRGB(int[] rgb) Convert RGB values in sRGB to CIELab in ICC PCS.
static float[]	getCIEXYZFromLAB(float[] cieLab) Convert CIE 1976 L*, a*, b* to CIEXYZ.
static float[]	getCIEXYZPCSFromSRGB(int[] rgb) Convert RGB values in sRGB to CIEXYZ in ICC PCS.
static int[]	getIntegerScaledCIELabFromCIELab(float[] cieLab) Convert floating point CIELab values to the 16 bit fractional integer scaled representation used in ICC profiles and DICOM.
static int[]	getIntegerScaledCIELabPCSFromSRGB(int[] rgb) Convert RGB values in sRGB to 16 bit fractional integer scaled CIELab in ICC PCS.
static int[]	getSRGBFromCIELabPCS(float[] cieLab) Convert CIELab in ICC PCS to RGB values in sRGB.
static int[]	getSRGBFromCIEXYZPCS(float[] cieXYZ) Convert CIEXYZ in ICC PCS to RGB values in sRGB.
static int[]	getSRGBFromIntegerScaledCIELabPCS(int[] cieLabScaled) Convert 16 bit fractional integer scaled CIELab in ICC PCS to RGB values in sRGB.
static void	main(java.lang.String[] arg) Convert color values

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getCIELabFromXYZ

public static float[] getCIELabFromXYZ(float[] cieXYZ)

Convert CIEXYZ to CIE 1976 L*, a*, b*.

Parameters:

cieXYZ - array of length 3 containing X,Y,Z values return array of length 3 containing L*,a*,b* values

See Also:

Wikipedia CIELAB-CIEXYZ_conversions

getCIELabPCSFromIntegerScaledCIELabPCS

public static float[] getCIELabPCSFromIntegerScaledCIELabPCS(int[] cieLabScaled)

Convert 16 bit fractional integer scaled CIELab values used in ICC profiles and DICOM to floating point.

See ICC v4.3 Tables 12 and 13, and DICOM PS 3.3 C.10.7.1.1.

Parameters:

cieLabScaled - array of length 3 containing 16 bit scaled L*,a*,b* values from 0 to 65535 return array of length 3 containing L*,a*,b* values with L* from 0.0 to 100.0, and a* and b* from -128.0 to +127.0

getCIELabPCSFromSRGB

public static float[] getCIELabPCSFromSRGB(int[] rgb)

Convert RGB values in sRGB to CIELab in ICC PCS.

Parameters:

rgb - array of length 3 containing R,G,B values each from 0 to 255 return array of length 3 containing L*,a*,b* values

getCIEXYZFromLAB

public static float[] getCIEXYZFromLAB(float[] cieLab)

Convert CIE 1976 L*, a*, b* to CIEXYZ.

Parameters:

cieLab - array of length 3 containing L*,a*,b* values return array of length 3 containing X,Y,Z values

See Also:

Wikipedia CIELAB-CIEXYZ_conversions

getCIEXYZPCSFromSRGB

public static float[] getCIEXYZPCSFromSRGB(int[] rgb)

Convert RGB values in sRGB to CIEXYZ in ICC PCS.

SRGB Observer = 2°, Illuminant = D65, XYZ PCS Illuminant = D50.

Parameters:

rgb - array of length 3 containing R,G,B values each from 0 to 255 return array of length 3 containing X,Y,Z values

See Also:

Wikipedia SRGB Reverse Transformation

getIntegerScaledCIELabFromCIELab

public static int[] getIntegerScaledCIELabFromCIELab(float[] cieLab)

Convert floating point CIELab values to the 16 bit fractional integer scaled representation used in ICC profiles and DICOM.

See ICC v4.3 Tables 12 and 13, and DICOM PS 3.3 C.10.7.1.1.

Parameters:

cieLab - array of length 3 containing L*,a*,b* values with L* from 0.0 to 100.0, and a* and b* from -128.0 to +127.0 return array of length 3 containing 16 bit scaled L*,a*,b* values from 0 to 65535

getIntegerScaledCIELabPCSFromSRGB

public static int[] getIntegerScaledCIELabPCSFromSRGB(int[] rgb)

Convert RGB values in sRGB to 16 bit fractional integer scaled CIELab in ICC PCS.

Parameters:

rgb - array of length 3 containing R,G,B values each from 0 to 255 return array of length 3 containing L*,a*,b* values each from 0 to 65535

getSRGBFromCIELabPCS

public static int[] getSRGBFromCIELabPCS(float[] cieLab)

Convert CIELab in ICC PCS to RGB values in sRGB.

Parameters:

cieLab - array of length 3 containing L*,a*,b* values return array of length 3 containing R,G,B values each from 0 to 255

getSRGBFromCIEXYZPCS

public static int[] getSRGBFromCIEXYZPCS(float[] cieXYZ)

Convert CIEXYZ in ICC PCS to RGB values in sRGB.

SRGB Observer = 2°, Illuminant = D65, XYZ PCS Illuminant = D50.

Parameters:

cieXYZ - array of length 3 containing X,Y,Z values return array of length 3 containing R,G,B values each from 0 to 255

See Also:

Wikipedia SRGB Forward Transformation

getSRGBFromIntegerScaledCIELabPCS

public static int[] getSRGBFromIntegerScaledCIELabPCS(int[] cieLabScaled)

Convert 16 bit fractional integer scaled CIELab in ICC PCS to RGB values in sRGB.

Parameters:

cieLabScaled - array of length 3 containing L*,a*,b* values each from 0 to 65535 return array of length 3 containing R,G,B values each from 0 to 255

main

public static void main(java.lang.String[] arg)

Convert color values

Parameters:

arg - sRGB8toCIELab16 or CIELab16tosRGB8 (case insensitive) and three color values (each decimal or 0xhex)