ij.process
Class ColorSpaceConverter

java.lang.Object
  ij.process.ColorSpaceConverter

public class ColorSpaceConverter
extends Object

ColorSpaceConverter

Author:

dvs, hlp Created Jan 15, 2004 Version 3 posted on ImageJ Mar 12, 2006 by Duane Schwartzwald vonschwartzwalder at mac.com Version 4 created Feb. 27, 2007 by Harry Parker, harrylparker at yahoo dot com, corrects RGB to XYZ (and LAB) conversion.

Field Summary

double[]	chromaD50 reference white in xyY coordinates
double[]	chromaD55
double[]	chromaD65
double[]	chromaD75
double[]	chromaWhitePoint
double[]	D50 reference white in XYZ coordinates
double[]	D55
double[]	D65
double[]	D75
double[][]	M sRGB to XYZ conversion matrix
double[][]	Mi XYZ to sRGB conversion matrix
double[]	whitePoint

Constructor Summary

ColorSpaceConverter()
Default constructor; uses D65 for the white point

ColorSpaceConverter(String white)
Constructor for setting a non-default white point

Method Summary

int[]	HSBtoRGB(double[] HSB)
int[]	HSBtoRGB(double H, double S, double B)
int[]	LABtoRGB(double[] Lab)
int[]	LABtoRGB(double L, double a, double b) Convert LAB to RGB.
ImagePlus	LabToRGB(ImagePlus img) Converts a Lab stack into an RGB image.
double[]	LABtoXYZ(double[] Lab) Convert LAB to XYZ.
double[]	LABtoXYZ(double L, double a, double b) Convert LAB to XYZ.
double[]	RGBtoHSB(int[] RGB)
double[]	RGBtoHSB(int R, int G, int B)
ImagePlus	RGBToLab(ImagePlus img) Converts an RGB image into a Lab stack.
double[]	RGBtoLAB(int rgb)
double[]	RGBtoLAB(int[] RGB)
double[]	RGBtoXYZ(int[] RGB) Convert RGB to XYZ
double[]	RGBtoXYZ(int R, int G, int B) Convert RGB to XYZ
double[]	xyYtoXYZ(double[] xyY)
double[]	xyYtoXYZ(double x, double y, double Y)
double[]	XYZtoLAB(double[] XYZ) Convert XYZ to LAB.
double[]	XYZtoLAB(double X, double Y, double Z) Convert XYZ to LAB.
int[]	XYZtoRGB(double[] XYZ) Convert XYZ to RGB
int[]	XYZtoRGB(double X, double Y, double Z) Convert XYZ to RGB.
double[]	XYZtoxyY(double[] XYZ)
double[]	XYZtoxyY(double X, double Y, double Z)

Methods inherited from class java.lang.Object

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

Field Detail

D50

public double[] D50

reference white in XYZ coordinates

D55

public double[] D55

D65

public double[] D65

D75

public double[] D75

whitePoint

public double[] whitePoint

chromaD50

public double[] chromaD50

reference white in xyY coordinates

chromaD55

public double[] chromaD55

chromaD65

public double[] chromaD65

chromaD75

public double[] chromaD75

chromaWhitePoint

public double[] chromaWhitePoint

M

public double[][] M

sRGB to XYZ conversion matrix

Mi

public double[][] Mi

XYZ to sRGB conversion matrix

Constructor Detail

ColorSpaceConverter

public ColorSpaceConverter()

Default constructor; uses D65 for the white point

ColorSpaceConverter

public ColorSpaceConverter(String white)

Constructor for setting a non-default white point

Parameters:

white - "d50", "d55", "d65" or "d75"

Method Detail

HSBtoRGB

public int[] HSBtoRGB(double H,
                      double S,
                      double B)

Parameters:

H - Hue angle/360 (0..1)

S - Saturation (0..1)

B - Value (0..1)

Returns:

RGB values

HSBtoRGB

public int[] HSBtoRGB(double[] HSB)

LABtoRGB

public int[] LABtoRGB(double L,
                      double a,
                      double b)

Convert LAB to RGB.

Parameters:

L -

a -

b -

Returns:

RGB values

LABtoRGB

public int[] LABtoRGB(double[] Lab)

Parameters:

Lab -

Returns:

RGB values

LABtoXYZ

public double[] LABtoXYZ(double L,
                         double a,
                         double b)

Convert LAB to XYZ.

Parameters:

L -

a -

b -

Returns:

XYZ values

LABtoXYZ

public double[] LABtoXYZ(double[] Lab)

Convert LAB to XYZ.

Parameters:

Lab -

Returns:

XYZ values

RGBtoHSB

public double[] RGBtoHSB(int R,
                         int G,
                         int B)

Parameters:

R - Red in range 0..255

G - Green in range 0..255

B - Blue in range 0..255

Returns:

HSB values: H is 0..360 degrees / 360 (0..1), S is 0..1, B is 0..1

RGBtoHSB

public double[] RGBtoHSB(int[] RGB)

RGBtoLAB

public double[] RGBtoLAB(int rgb)

Parameters:

rgb - RGB value

Returns:

Lab values

RGBtoLAB

public double[] RGBtoLAB(int[] RGB)

Parameters:

RGB -

Returns:

Lab values

RGBtoXYZ

public double[] RGBtoXYZ(int R,
                         int G,
                         int B)

Convert RGB to XYZ

Parameters:

R -

G -

B -

Returns:

XYZ in double array.

RGBtoXYZ

public double[] RGBtoXYZ(int[] RGB)

Convert RGB to XYZ

Parameters:

RGB -

Returns:

XYZ in double array.

xyYtoXYZ

public double[] xyYtoXYZ(double x,
                         double y,
                         double Y)

Parameters:

x -

y -

Y -

Returns:

XYZ values

xyYtoXYZ

public double[] xyYtoXYZ(double[] xyY)

Parameters:

xyY -

Returns:

XYZ values

XYZtoLAB

public double[] XYZtoLAB(double X,
                         double Y,
                         double Z)

Convert XYZ to LAB.

Parameters:

X -

Y -

Z -

Returns:

Lab values

XYZtoLAB

public double[] XYZtoLAB(double[] XYZ)

Convert XYZ to LAB.

Parameters:

XYZ -

Returns:

Lab values

XYZtoRGB

public int[] XYZtoRGB(double X,
                      double Y,
                      double Z)

Convert XYZ to RGB.

Parameters:

X -

Y -

Z -

Returns:

RGB in int array.

XYZtoRGB

public int[] XYZtoRGB(double[] XYZ)

Convert XYZ to RGB

Parameters:

XYZ - in a double array.

Returns:

RGB in int array.

XYZtoxyY

public double[] XYZtoxyY(double X,
                         double Y,
                         double Z)

Parameters:

X -

Y -

Z -

Returns:

xyY values

XYZtoxyY

public double[] XYZtoxyY(double[] XYZ)

Parameters:

XYZ -

Returns:

xyY values

RGBToLab

public ImagePlus RGBToLab(ImagePlus img)

Converts an RGB image into a Lab stack.

LabToRGB

public ImagePlus LabToRGB(ImagePlus img)

Converts a Lab stack into an RGB image.