Performs a somewhat subjective analysis of a color to determine how dark it looks to a user

   
/*
 * ColorUtils.java Created Nov 17, 2010 by Andrew Butler, PSL
 */
//package prisms.util;

import java.awt.Color;

/** A set of tools for analyzing and manipulating colors */
public class ColorUtils
{


  /**
   * Performs a somewhat subjective analysis of a color to determine how dark it looks to a user
   * 
   * @param color The color to analyze
   * @return The darkness of the color
   */
  public static float getDarkness(Color color)
  {
    float ret = color.getRed() + color.getGreen() + color.getBlue() / 10;
    ret /= (255 + 255 + 255 / 10);
    ret = 1 - ret;
    final float lightDarkBorder = 0.7f;
    if(ret > lightDarkBorder)
      ret = 0.5f + (ret - lightDarkBorder) * 0.5f / (1 - lightDarkBorder);
    else
      ret = ret * 0.5f / lightDarkBorder;
    return ret;
  }
}

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Performs a somewhat subjective analysis of a color to determine how dark it looks to a user : Color « 2D Graphics GUI « Java

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