MakeImage.java

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

/**
 * Simple demonstration of the bare necessities required to crate an image file
 * @author Peter
 */
public class MakeImage
{

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException
	{
		int width = 600;
		int height = 400;
		
		// Create the image
		BufferedImage im = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
		
		// Loop over all pixels 
		for (int i  = 0; i < width; i++)
			for (int j = 0; j < height; j++)
				// set to a given color
				im.setRGB(i, j, new Color(0.1f, 0.2f, 0.4f).getRGB());
		
		
		// Write the image to the file system
		ImageIO.write(im, "PNG", new File("myimage.png"));
	}

}