I am writing an application where the user can change the color of the image on screen by choosing a new color. I have a simple image - only 40x40 - like this:
I have tried many things: pixel replacement, ColorModel, RGBFilter, etc. I can't figure this image stuff out. In the process of trying, I have learned about BufferedImage and I can get the .png's into that format and displayed on screen. I can turn the shape into a solid blob of color using pixel replacement, but the results are horrible.
From what I've gleaned, I want to use a ColorModel or Filter, but I am stumped. Here is a simple app that demonstrates where I am.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class ChangeImageColor {
public static void main(String[] args) {
final ChangeColor cc = new ChangeColor();
java.awt.EventQueue.invokeLater( new Runnable() { @Override
public void run() { cc.setVisible( true ); }}
); // invokeLater
} // main
} // ChangeImageColor
class ChangeColor extends JFrame {
String CHAR_HEAD = "res/images/char/Head.png";
JLabel imageHead = new JLabel( new ImageIcon( CHAR_HEAD ) );
JButton buttonChoose = new JButton( "Choose Color" );
public ChangeColor() {
this.setSize( 200, 200 );
this.setLayout( new BorderLayout() );
buttonChoose.addActionListener( listenerButton );
this.add( imageHead, BorderLayout.CENTER );
this.add( buttonChoose, BorderLayout.SOUTH );
} // constructor
ActionListener listenerButton = new ActionListener() {
@Override public void actionPerformed( ActionEvent event ) {
Color newColor = JColorChooser.showDialog( null, "Choose Color", Color.RED );
ImageIcon icon = new ImageIcon( CHAR_HEAD );
System.out.println( "~" + newColor );
// *****************
// insert code to change color of Head.png to shades of chosen color
// *****************
imageHead.setIcon( icon );
} // actionPerformed
};
} // class
(I've never worked with dynamic colors and images, so I'm way over my head. Thanks in advance for your help.)
Edit: Here is a "before" and "after" image of what I would like after a darker color is chosen:
Perhaps there is a more elegant and efficient version but if you have a BufferedImage you could try something like:
BufferedImage image;
for(int y = 0; y < image.getHeight(); y++)
for(int x = 0; x < image.getWidth(); x++)
{
Color imageColor = new Color(image.getRGB(x, y));
//mix imageColor and desired color
image.setRGB(x, y, imageColor.getRGB());
}
Maybe this is the real problem: Mixing the two colors can be done by multiplying them...
Edit:
private Color multiply(Color color1, Color color2)
{
float[] color1Components = color1.getRGBComponents(null);
float[] color2Components = color2.getRGBColorComponents(null);
float[] newComponents = new float[3];
for(int i = 0; i < 3; i++)
newComponents[i] = color1Components[i] * color2Components[i];
return new Color(newComponents[0], newComponents[1], newComponents[2],
color1Components[3]);
}