Creates PNG images of the specified color that fade from fully opaque to fully transparent : Image « 2D Graphics « Java Tutorial

 * Copyright (c) 2004 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 3nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose,
 * including teaching and use in open-source projects.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book, 
 * please visit

import java.awt.*;
import java.awt.image.*;

 * This program creates PNG images of the specified color that fade from fully
 * opaque to fully transparent. Images of this sort are useful in web design
 * where they can be used as background images and combined with background
 * colors to produce two-color fades. (IE6 does not support PNG transparency).
 * Images are produced in three sizes and with and 8 directions. The images are
 * written into the current directory and are given names of the form:
 * fade-to-color-speed-direction.png
 * color: the color name specified on the command line speed: slow (1024px),
 * medium (512px), fast(256px) direction: a compass point: N, E, S, W, NE, SE,
 * SW, NW
 * Invoke this program with a color name and three floating-point values
 * specifying the red, green, and blue components of the color.
public class MakeFades {
  // A fast fade is a small image, and a slow fade is a large image
  public static final String[] sizeNames = { "fast", "medium", "slow" };

  public static final int[] sizes = { 256, 512, 1024 };

  // Direction names and coordinates
  public static final String[] directionNames = { "N", "E", "S", "W", "NE", "SE", "SW", "NW" };

  public static float[][] directions = { new float[] { 0f, 1f, 0f, 0f }, // North
      new float[] { 0f, 0f, 1f, 0f }, // East
      new float[] { 0f, 0f, 0f, 1f }, // South
      new float[] { 1f, 0f, 0f, 0f }, // West
      new float[] { 0f, 1f, 1f, 0f }, // Northeast
      new float[] { 0f, 0f, 1f, 1f }, // Southeast
      new float[] { 1f, 0f, 0f, 1f }, // Southwest
      new float[] { 1f, 1f, 0f, 0f } // Northwest

  public static void main(String[] args) throws IOException, NumberFormatException {

    // Create from and to colors based on those arguments
    Color from = Color.RED; // transparent
    Color to = Color.BLACK; // opaque

    // Loop through the sizes and directions, and create an image for each
    for (int s = 0; s < sizes.length; s++) {
      for (int d = 0; d < directions.length; d++) {
        // This is the size of the image
        int size = sizes[s];

        // Create a GradientPaint for this direction and size
        Paint paint = new GradientPaint(directions[d][0] * size, directions[d][1] * size, from,
            directions[d][2] * size, directions[d][3] * size, to);

        // Start with a blank image that supports transparency
        BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);

        // Now use fill the image with our color gradient
        Graphics2D g = image.createGraphics();
        g.fillRect(0, 0, size, size);

        // This is the name of the file we'll write the image to
        File file = new File("fade-to-" + sizeNames[s] + "-" + directionNames[d]
            + ".png");

        // Save the image in PNG format using the javax.imageio API
        javax.imageio.ImageIO.write(image, "png", file);

        // Show the user our progress by printing the filename

16.26.1.Draw ImageDraw Image
16.26.2.Resize an imageResize an image
16.26.3.Load Image and scale itLoad Image and scale it
16.26.4.Flush an image
16.26.5.Reading an Image or Icon from a File
16.26.6.Get the dimensions of the image; these will be non-negative
16.26.7.Draw an Icon object
16.26.8.Scaling a Drawn Image
16.26.9.Shearing a Drawn Image
16.26.10.Rotating a Drawn Image
16.26.11.Translating a Drawn Image
16.26.12.Creates PNG images of the specified color that fade from fully opaque to fully transparent
16.26.13.Determining If an Image Has Transparent Pixels
16.26.14.Getting the Color Model of an Image
16.26.15.Filtering the RGB Values in an Image
16.26.16.Flip an image
16.26.17.Blur our image: Blur means an unfocused image
16.26.18.A reflected image: effect makes an illusion as if the image was reflected in water
16.26.19.Use PixelGrabber class to acquire pixel data from an Image object
16.26.20.Calculation of the mean value of an image
16.26.21.This filter removes all but the red values in an image
16.26.22.Using mediatracker to pre-load images
16.26.23.Create a grayscale image with Java 2D tools
16.26.24.Shrinking an image by skipping pixels
16.26.25.Get average of a set of images
16.26.26.Enlarging an image by pixel replication
16.26.27.A 3x3 kernel that blurs an image.
16.26.28.A 3x3 kernel that sharpens an image.
16.26.29.A 3x3 kernel that embosses an image.
16.26.30.Brighten the image by 30%
16.26.31.Darken the image by 10%
16.26.32.Create a filter that can modify any of the RGB pixel values in an image.
16.26.33.Gray scale image operation