ImageUtil.java Source code

Introduction

Here is the source code for ImageUtil.java

Source

//package modrcon;

import java.awt.image.*;
import java.awt.color.*;
import javax.swing.*;
import java.awt.*;

/**
 * Takes an image and returns the Gray scale copy of it. This class is static and
 * therefore cannot be instantiated. Proper usage is to call ImageGrayer.grayImage();
 * @author izuriel
 */
public class ImageUtil {

    /**
     * Posted by alpha02 at http://www.dreamincode.net/code/snippet1076.htm
     */
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage)
            return (BufferedImage) image;

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels
        boolean hasAlpha = hasAlpha(image);

        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;

            if (hasAlpha == true)
                transparency = Transparency.BITMASK;

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();

            bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
        } //No screen

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;

            if (hasAlpha == true) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage)
            return ((BufferedImage) image).getColorModel().hasAlpha();

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        return pg.getColorModel().hasAlpha();
    }
}