This method makes the color in image transparent. - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Color

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Description

This method makes the color in image transparent.

Demo Code


//package com.java2s;
import java.awt.Color;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.awt.image.ImageProducer;
import java.awt.image.RGBImageFilter;

public class Main {
    /**/*from w ww  . j  a v a  2 s .c  om*/
     * This method makes the color in image transparent.
     *
     * @param im
     *            The image who's color needs to be made transparent.
     * @param color
     *            The color which needs to be filtered out of the image.
     * @return Image from which the color has been removed.
     */
    public static Image makeColorTransparent(Image im, final Color color) {

        ImageFilter filter = new RGBImageFilter() {

            // the color we are looking for... Alpha bits are set to opaque
            public int markerRGB = color.getRGB() | 0xFF000000;

            @Override
            public final int filterRGB(int x, int y, int rgb) {
                if ((rgb | 0xFF000000) == markerRGB) {
                    // Mark the alpha bits as zero - transparent
                    return 0x00FFFFFF & rgb;
                } else {
                    // nothing to do
                    return rgb;
                }
            }
        };

        ImageProducer ip = new FilteredImageSource(im.getSource(), filter);
        return Toolkit.getDefaultToolkit().createImage(ip);
    }
}

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