Image Utils : Image « 2D Graphics GUI « Java

Image Utils

 * Balloontip - Balloon tips for Java Swing applications
 * Copyright 2007, 2008 Bernhard Pauler, Tim Molderez
 * This file is part of Balloontip.
 * Balloontip is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * Balloontip is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License
 * along with Balloontip.  If not, see <>.

import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;

import javax.swing.ImageIcon;

 * Some methods for use with an Image
 * @author Tim Molderez
public class ImageUtils {
   * Disallow instantiating this class
  private ImageUtils() {};
   * This method returns true if the specified image has transparent pixels
   * This snippet was taken from:
   * @param image
   * @return True if the image has any transparency
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage)image;
            return bimage.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 {
        } catch (InterruptedException e) {
        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
   * This method returns a buffered image with the contents of an image
   * This snippet was taken from:
   * @param image
   * @return The buffered image
    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; for this method's
        // implementation, see e661 Determining If an 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) {
                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) {
            // The system does not have a screen
        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                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);
        return bimage;


Related examples in the same category

1.Image size Image size
2.Image demoImage demo
3.Getting the Color Model of an Image
4.Filtering the RGB Values in an Image
5.Create a filter that can modify any of the RGB pixel values in an image.
6.This filter removes all but the red values in an image
7.Load and draw image
8.Paint an IconPaint an Icon
9.Image Processing: Brightness and ContrastImage Processing: Brightness and Contrast
10.Image with mouse drag and move eventImage with mouse drag and move event
11.Image Animation and ThreadImage Animation and Thread
12.Image Color Gray EffectImage Color Gray Effect
13.Image BufferingImage Buffering
14.Image Effect: CombineImage Effect: Combine
15.AffineTransform demoAffineTransform demo
16.Image Effect: Rotate Image using DataBufferImage Effect: Rotate Image using DataBuffer
17.Image Effect: Sharpen, blurImage Effect: Sharpen, blur
18.Image scale
19.Image crop
20.Demonstrating the Drawing of an Image with a Convolve Operation
21.Demonstrating Use of the Image I/O Library
22.Adding Image-Dragging Behavior
23.Sending Image Objects through the ClipboardSending Image Objects through the Clipboard
24.Anti AliasAnti Alias
25.Image OperationsImage Operations
26.Image ViewerImage Viewer
27.Get the dimensions of the image; these will be non-negative
28.Standalone Image Viewer - works with any AWT-supported format
29.Toolkit.getImage() which works the same in either Applet or Application
30.Double Buffered Image
31.Graband Fade: displays image and fades to black
32.Graband Fade with Rasters
33.Rotate Image 45 Degrees
34.Convert java.awt.image.BufferedImage to java.awt.Image
35.Filter image by multiplier its red, green and blue color
36.Drags within the imageDrags within the image
37.TYPE_INT_RGB and TYPE_INT_ARGB are typically used
38.Pixels from a buffered image can be modified
39.Calculation of the mean value of an image with Raster
40.Use PixelGrabber class to acquire pixel data from an Image object
41.Flip an image
42.Rendered Image
43.Image Panel
44.Returns an image resource.
45.Create Gradient Image
46.Create Gradient Mask
47.Create Translucent Image
48.Make Raster Writable
49.A frame that displays an image
50.Optimized version of copyData designed to work on Integer packed data with a SinglePixelPackedSampleModel
51.Various image processing operations.Various image processing operations.
52.This program demonstrates the transfer of images between a Java application and the system clipboard.This program demonstrates the transfer of images between a Java application and the system clipboard.
53.Scales down an image into a box of maxSideLenght x maxSideLength.
54.Adding watermark to an image
55.Scale Image
56.Crop Image
57.Fit Image
58.Converts a java.awt.Image into an array of pixels
59.Creates a scaled copy of the source image.
60.Provides useful methods for converting images from one colour depth to another.
61.Reads an image in a file and creates a thumbnail in another file.
62.Make image TransparencyMake image Transparency
63.Clips the input image to the specified shape
64.Image Sorter frame
65.Returns an ImageIcon, or null if the path was invalid.
66.Create new image from source image
67.check if image supported
68.Get supported image format
69.get image thumbnail
70.get image orientation type
71.get fixing preview image