//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();
}
}