Seems Abuse beat me to it. Here’s my solution:
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
import javax.swing.*;
public class ImageMasker
{
public static BufferedImage createTileMask(BufferedImage tile, BufferedImage mask)
{
GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
BufferedImage result = gc.createCompatibleImage(tile.getWidth(null), tile.getHeight(null), Transparency.BITMASK);
BufferedImage temp = gc.createCompatibleImage(tile.getWidth(null), tile.getHeight(null), Transparency.BITMASK);
WritableRaster raster = result.getRaster();
Raster maskData = mask.getRaster();
Raster tileData = tile.getRaster();
Graphics g;
int[] pixel = new int[4];
int width = tile.getWidth(null);
int height = tile.getHeight(null);
for(int y=0; y<height; y++)
{
for(int x=0; x<width; x++)
{
pixel = maskData.getPixel(x, y, pixel);
if(pixel[0] == 0)
{
tileData.getPixel(x, y, pixel);
pixel[3] = 255;
raster.setPixel(x, y, pixel);
pixel = tileData.getPixel(x, y, pixel);
}
}
}
result.setData(raster);
g = temp.createGraphics();
g.drawImage(result, 0, 0, null);
g.dispose();
return temp;
}
public static void main(String[] args)
{
try
{
BufferedImage tile = ImageIO.read(new File("color.jpg"));
BufferedImage mask = ImageIO.read(new File("bw.jpg"));
BufferedImage masked = createTileMask(tile, mask);
JFrame frame = new JFrame();
ImageIcon icon = new ImageIcon(masked);
JLabel label = new JLabel(icon);
frame.getContentPane().add(label);
frame.pack();
frame.setVisible(true);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
It’s inefficient, but it works. BTW, I highly recommend not using JPGs for game images unless you are dealing with photographs. You’ll cause all kinds of unpredictable artifacts.
P.S. Anyone know how to get this forum to actually preserve spacing? It keeps mucking with my code.
