Create BufferredImage with colors based on integer array : BufferedImage « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. BufferedImage

import java.awt.Graphics;
import java.awt.image.BufferedImage;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class ColorPan extends JComponent {
  public void paint(Graphics g) {
    int width = getSize().width;
    int height = getSize().height;
    int[] data = new int[width * height];
    int i = 0;
    for (int y = 0; y < height; y++) {
      int red = (y * 255) / (height - 1);
      for (int x = 0; x < width; x++) {
        int green = (x * 255) / (width - 1);
        int blue = 128;
        data[i++] = (red << 16) | (green << 8) | blue;
      }
    }
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    image.setRGB(0, 0, width, height, data, 0, width);
    g.drawImage(image, 0, 0, this);
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("ColorPan");
    frame.getContentPane().add(new ColorPan());
    frame.setSize(300, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}