ColorComponentScaler.java Source code

Introduction

Here is the source code for ColorComponentScaler.java

Source

/*
    
Java Media APIs: Cross-Platform Imaging, Media and Visualization
Alejandro Terrazas
Sams, Published November 2002, 
ISBN 0672320940
*/

import java.awt.Color;
import java.awt.image.RGBImageFilter;

/**
 * ColorComponentScaler -- filters an image by multiplier its red, green and
 * blue color components by their given scale factors
 */
public class ColorComponentScaler extends RGBImageFilter {
    private double redMultiplier, greenMultiplier, blueMultiplier;

    private int newRed, newGreen, newBlue;

    private Color color, newColor;

    /**
     * rm = red multiplier gm = green multiplier bm = blue multiplier
     */
    public ColorComponentScaler(double rm, double gm, double bm) {
        canFilterIndexColorModel = true;
        redMultiplier = rm;
        greenMultiplier = gm;
        blueMultiplier = bm;
    }

    private int multColor(int colorComponent, double multiplier) {
        colorComponent = (int) (colorComponent * multiplier);
        if (colorComponent < 0)
            colorComponent = 0;
        else if (colorComponent > 255)
            colorComponent = 255;

        return colorComponent;
    }

    /**
     * split the argb value into its color components, multiply each color
     * component by its corresponding scaler factor and pack the components back
     * into a single pixel
     */
    public int filterRGB(int x, int y, int argb) {
        color = new Color(argb);
        newBlue = multColor(color.getBlue(), blueMultiplier);
        newGreen = multColor(color.getGreen(), greenMultiplier);
        newRed = multColor(color.getRed(), redMultiplier);
        newColor = new Color(newRed, newGreen, newBlue);
        return (newColor.getRGB());
    }
}