Generates a hex grid image

MakeStencilScannerGrid.java

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class MakeStencilScannerGrid {
    public static void main(String[] args) throws Exception     {
        int imageSize = 1024;
        Color evenColour = new Color(0, 128, 128);
        Color oddColour = new Color(64, 64, 64);

        BufferedImage numberImage = new BufferedImage(imageSize, imageSize, BufferedImage.TYPE_INT_ARGB);
        BufferedImage maskImage = new BufferedImage(imageSize, imageSize, BufferedImage.TYPE_BYTE_GRAY);
	    Graphics2D numberImageGraphics = null;
	    Graphics2D maskImageGraphics = null;
        try {
	        numberImageGraphics = numberImage.createGraphics();
	        maskImageGraphics = maskImage.createGraphics();

            numberImageGraphics.setFont(new Font("Monaco", Font.PLAIN, 32));
            FontMetrics fontMetrics = numberImageGraphics.getFontMetrics();
            int textHeight = fontMetrics.getAscent();
            int textWidth = fontMetrics.stringWidth("00");
            int cellSize = (imageSize / 16);

            for (int row = 0; row < 16; row++) {
                for (int column = 0; column < 16; column++) {
                	int number = row * 16 + column;
                    String numberString = Integer.toHexString(row) + Integer.toHexString(column);
                    boolean evenCell = ((column + row) % 2) == 0;
                    int x1 = column * (imageSize / 16);
                    int y1 = row * (imageSize / 16);

                    numberImageGraphics.setColor(evenCell ? evenColour : oddColour);
                    numberImageGraphics.fillRect(x1, y1, cellSize, cellSize);
                    numberImageGraphics.setColor(evenCell ? oddColour : evenColour);
                    numberImageGraphics.drawString(numberString, x1 + (cellSize - textWidth) / 2, y1 + (cellSize + textHeight) / 2);

                    maskImageGraphics.setColor(new Color(number, number, number));
                    maskImageGraphics.fillRect(x1, y1, cellSize, cellSize);
                }
            }
        } finally {
        	if (numberImageGraphics != null) {
        		numberImageGraphics.dispose();
        	}
        	if (maskImageGraphics != null) {
        		maskImageGraphics.dispose();
        	}
        }

        ImageIO.write(numberImage, "PNG", new File("StencilScannerGrid.png"));
     	ImageIO.write(maskImage, "PNG", new File("StencilScannerMask.png"));
    }
}