Here you can find the source of rgb2xyz(double[] rgb, double[] xyz)
| Parameter | Description |
|---|---|
| rgb | Color components in the sRGB color space. |
| xyz | Optional array to store color components in the CIE XYZ color space. |
public static double[] rgb2xyz(double[] rgb, double[] xyz)
//package com.java2s; //License from project: Open Source License public class Main { /**/* ww w .java2s .co m*/ * sRGB to CIE XYZ conversion matrix. See * http://www.brucelindbloom.com/index.html?WorkingSpaceInfo.html#Specifications * * */ private static final double[] MATRIX_SRGB2XYZ_D50 = { 0.436052025, 0.385081593, 0.143087414, 0.222491598, 0.716886060, 0.060621486, 0.013929122, 0.097097002, 0.714185470 }; /** * Converts color components from the sRGB to the CIE XYZ color space. * A D50 white point is assumed for the sRGB conversion. If the <i>xyz</i> * array is {@code null}, a new one will be created with the same * size as the <i>rgb</i> array. * * See http://www.brucelindbloom.com/index.html?Eqn_RGB_to_XYZ.html * * @param rgb Color components in the sRGB color space. * @param xyz Optional array to store color components in the CIE XYZ color * space. * @return Color components in the CIE XYZ color space. */ public static double[] rgb2xyz(double[] rgb, double[] xyz) { if (xyz == null) { xyz = new double[rgb.length]; } // Remove sRGB companding to make RGB components linear double[] rgbLin = new double[rgb.length]; for (int i = 0; i < rgb.length; i++) { if (rgb[i] <= 0.04045) { rgbLin[i] = rgb[i] / 12.92; } else { rgbLin[i] = Math.pow((rgb[i] + 0.055) / 1.055, 2.4); } } // Convert linear sRGB with D50 white point to CIE XYZ for (int i = 0; i < xyz.length; i++) { xyz[i] = MATRIX_SRGB2XYZ_D50[i * 3 + 0] * rgbLin[0] + MATRIX_SRGB2XYZ_D50[i * 3 + 1] * rgbLin[1] + MATRIX_SRGB2XYZ_D50[i * 3 + 2] * rgbLin[2]; } return xyz; } }