public BufferedImage EdgeW(BufferedImage bi)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(3, 3, new float[] {
														-1f, 0f, 1f, 
														-2f, 0f, 2f, 
														-1f, 0f, 1f
													 });
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

	public BufferedImage EdgeH(BufferedImage bi)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(3, 3, new float[] {
														-1f, -2f, -1f, 
														 0f,  0f,  0f, 
														 1f,  2f,   1f
													 });
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

public BufferedImage brightness(BufferedImage bi, float value)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(1, 1, new float[] {value});
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class screen2image
{
	public static void main(String[] args) throws Exception
	{
		Robot robot = new Robot();
		
		BufferedImage screenShot = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
		ImageIO.write(screenShot, "JPG", new File("screenShot.jpg"));
	}
}

	public BufferedImage Embrossing(BufferedImage bi)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(3, 3, new float[] {
														-2f, 0f, 0f, 
														 0f, 1f, 0f, 
														 0f, 0f, 2f
													 });
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

	public BufferedImage Blurring(BufferedImage bi)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(3, 3, new float[] {
														1f/9f, 1f/9f, 1f/9f, 
														1f/9f, 1f/9f, 1f/9f, 
														1f/9f, 1f/9f, 1f/9f
													 });
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

	public BufferedImage Sharpening(BufferedImage bi)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(3, 3, new float[] {
														-1f, -1f, -1f, 
														-1f,  9f, -1f, 
														-1f, -1f, -1f
													 });
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

public BufferedImage toGray(BufferedImage bi)
	{
		ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
		ColorConvertOp op = new ColorConvertOp(cs, null);
		
		return op.filter(bi, null);
	}

public BufferedImage rotate90DX(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(height, width, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biFlip.setRGB(height-1-j, width-1-i, bi.getRGB(i, j));
		
		return biFlip;
	}

	public BufferedImage rotate90SX(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(height, width, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biFlip.setRGB(j, i, bi.getRGB(i, j));
		
		return biFlip;
	}

	public BufferedImage halfFlipW(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(width, height, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height/2; j++)
			{
				biFlip.setRGB(i, j, bi.getRGB(i, j));
				biFlip.setRGB(i, (height-1)-j, bi.getRGB(i, j));
			}
		
		return biFlip;
	}

	public BufferedImage halfFlipH(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(width, height, bi.getType());
		
		for(int i=0; i<width/2; i++)
			for(int j=0; j<height; j++)
			{
				biFlip.setRGB(i, j, bi.getRGB(i, j));
				biFlip.setRGB((width-1)-i, j, bi.getRGB(i, j));
			}
		
		return biFlip;
	}

public BufferedImage flipH(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(width, height, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biFlip.setRGB((width-1)-i, j, bi.getRGB(i, j));
		
		return biFlip;
	}

	
	public BufferedImage flipW(BufferedImage bi)
	{
		int width = bi.getWidth();
		int height = bi.getHeight();
		
		BufferedImage biFlip = new BufferedImage(width, height, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biFlip.setRGB(i, (height-1)-j, bi.getRGB(i, j));
		
		return biFlip;
	}

public BufferedImage zoomOut(BufferedImage bi, int scale)
	{
		int width = bi.getWidth() / scale;
		int height = bi.getHeight() / scale;
		
		BufferedImage biScale = new BufferedImage(width, height, bi.getType());
		
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biScale.setRGB(i, j, bi.getRGB(i*scale, j*scale));
		
		return biScale;
	}

public BufferedImage zoomIn(BufferedImage bi, int scale)
	{
		int width = scale * bi.getWidth();
		int height = scale * bi.getHeight();
		
		BufferedImage biScale = new BufferedImage(width, height, bi.getType());
		
                // Cicla dando un valore medio al pixel corrispondente
		for(int i=0; i<width; i++)
			for(int j=0; j<height; j++)
				biScale.setRGB(i, j, bi.getRGB(i/scale, j/scale));
		
		return biScale;
	}