ColorPaletteMaker.java

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

/**
 * Makes a palette image to use in GIMP or something
 * @author CCHall 
 */
public class ColorPaletteMaker {
	public static void main(String[] args){
		// 12 hues * 3 saturation values * 5 values = 180 colors
		int numHues = 12;
		int numSaturations = 4;
		int numShades = 5;
		int width = numShades * numSaturations;
		int height = numHues;
		BufferedImage bimg = new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB);
		for(int h = 0; h < numHues; h++)
		for(int s = 0; s < numSaturations; s++)
		for(int v = 0; v < numShades; v++){
			int y = h;
			int x = s * numShades + v;
			
			float hue = (float)h / (float)(numHues);
			float sat = (float)s / (float)(numSaturations - 1);
			float val = (float)v / (float)(numShades - 1);
			
			bimg.setRGB(x, y, Color.HSBtoRGB(hue, sat, val));
		}
		
		
		JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(bimg)));
		try {
			ImageIO.write(bimg, "png", Paths.get("palette.png").toFile());
		} catch (IOException ex) {
			Logger.getLogger(ColorPaletteMaker.class.getName()).log(Level.SEVERE, null, ex);
		}
	}
}