Java by API/java.awt.image/BufferedImage

BufferedImage: getSource()

 
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.FilteredImageSource;
import java.awt.image.RGBImageFilter;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    NegativeFilter nf = new NegativeFilter();
    Image i = createImage(new FilteredImageSource(createImage().getSource(), nf));
    g.drawImage(i, 20, 20, this);
  }
  private BufferedImage createImage() {
    BufferedImage bufferedImage = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);
    Graphics g = bufferedImage.getGraphics();
    g.drawString("www.jexp.ru", 20, 20);
    return bufferedImage;
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}
class NegativeFilter extends RGBImageFilter {
  public NegativeFilter() {
    canFilterIndexColorModel = true;
  }
  public int filterRGB(int x, int y, int rgb) {
    return rgb ^ 0x00ffffff;
  }
}

BufferedImage: setRGB(int startX, int startY, int w, int h, int[] rgbArray, int offset, int scansize)

  
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class Main 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 Main());
    frame.setSize(300, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}

BufferedImage.TYPE_INT_RGB

  
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);
  }
}

BufferImage emboss

 
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    BufferedImage clone = emboss(createImage());
    
    g.drawImage(clone, 20,20,this);
  }
  public BufferedImage emboss(BufferedImage src) {
    int width = src.getWidth();
    int height = src.getHeight();
    BufferedImage dst;
    dst = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    for (int i = 0; i < height; i++)
      for (int j = 0; j < width; j++) {
        int upperLeft = 0;
        int lowerRight = 0;
        if (i > 0 && j > 0)
          upperLeft = src.getRGB(j - 1, i - 1);
        if (i < height - 1 && j < width - 1)
          lowerRight = src.getRGB(j + 1, i + 1);
        int redDiff = ((lowerRight >> 16) & 255) - ((upperLeft >> 16) & 255);
        int greenDiff = ((lowerRight >> 8) & 255) - ((upperLeft >> 8) & 255);
        int blueDiff = (lowerRight & 255) - (upperLeft & 255);
        int diff = redDiff;
        if (Math.abs(greenDiff) > Math.abs(diff))
          diff = greenDiff;
        if (Math.abs(blueDiff) > Math.abs(diff))
          diff = blueDiff;
        int grayColor = 128 + diff;
        if (grayColor > 255)
          grayColor = 255;
        else if (grayColor < 0)
          grayColor = 0;
        int newColor = (grayColor << 16) + (grayColor << 8) + grayColor;
        dst.setRGB(j, i, newColor);
      }
    return dst;
  }
  
  private BufferedImage createImage(){
    BufferedImage bufferedImage = new BufferedImage(200,200,BufferedImage.TYPE_INT_RGB);
    Graphics g = bufferedImage.getGraphics();
    g.drawString("www.jexp.ru", 20,20);
    
    return bufferedImage;
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
  
  
}

new BufferedImage(int width, int height, int imageType)

 
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public void paint(Graphics g) {
    Image img = createImage();
    g.drawImage(img, 20,20,this);
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
  
  private Image createImage(){
    BufferedImage bufferedImage = new BufferedImage(200,200,BufferedImage.TYPE_INT_RGB);
    Graphics g = bufferedImage.getGraphics();
    g.drawString("www.jexp.ru", 20,20);
    
    return bufferedImage;
  }
}