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package imaging.filters;
import java.awt.image.*;
/**
* A derivation of RGBImageFilter that bleaches an image.<p>
*
* Extent of the bleaching effect is controlled by the only
* constructor argument: an integer representing the percentage
* of bleaching. The percentage of bleaching may also be
* controlled after instantiation by invoking the
* void percent(int) method.<p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see RGBImageFilter
*/
public class BleachFilter extends RGBImageFilter implements MedFilter
{
private int percent;
public BleachFilter()
{
this(25);
}
public BleachFilter(int percent)
{
Assert.notFalse(percent >= 0 && percent <= 100);
this.percent = percent;
canFilterIndexColorModel = true;
}
public String info ()
{
return "Bleaches/Lightens an image";
}
public int percent() { return percent; }
public void percent(int percent) { percent = percent; }
public int filterRGB(int x, int y, int rgb) {
DirectColorModel cm =
(DirectColorModel)ColorModel.getRGBdefault();
int alpha = cm.getAlpha(rgb);
int red = cm.getRed (rgb);
int green = cm.getGreen(rgb);
int blue = cm.getBlue (rgb);
double percentMultiplier = (double)percent/100;
red = Math.min((int)
(red + (red * percentMultiplier)), 255);
green = Math.min((int)
(green + (green * percentMultiplier)), 255);
blue = Math.min((int)
(blue + (blue * percentMultiplier)), 255);
alpha = alpha << 24;
red = red << 16;
green = green << 8;
return alpha | red | green | blue;
}
}
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