Tuesday, June 11, 2013

Edit picture color

The EditPictureColor is able to change the color of your picture or image. It is easy to use. To change color of any part of the picture, click the mouse on the part. When the color chooser dialog is open, select a color then click OK.

The original picture before its color is edited.

picture before its color is edited

The picture after its color is edited.

picture after its color is edited.
EditPictureColor source code:

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Robot;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;
import javax.swing.JColorChooser;

//The PictureArea extends Canvas class
//It is where the picture is drawn
class PictureArea extends Canvas{
BufferedImage bi;
Robot rt;
int adjX;
int adjY;
PictureArea(String src){
addMouseListener(new MouseList()); //Register the PictureArea with the mouse event
try{
bi=ImageIO.read(new File(src)); //read the picture file
rt=new Robot(); //create a Robot object
}catch(Exception ie){}
adjX=0;
adjY=0;
}
class MouseList extends MouseAdapter{
public void mousePressed(MouseEvent e){
//fetch the color where the mouse is clicked
//since the PictureArea is not placed exactly at the point (0,0) on the window Frame
//we need to adjust the x-axis and y-axis of the clicked point so that 
//the pixel color at desired point can be achieved
Color colorFrom=rt.getPixelColor(e.getX()+adjX, e.getY()+adjY);
//show a color chooser dialog
Color colorTo=JColorChooser.showDialog(null, "Choose a color", Color.WHITE);
changeColor(colorFrom, colorTo); //change color of the picture 
repaint(); //redraw the Picture
}
}
//The changeColor method has code to change a color of the picture to a different color
//selected by the user from the color chooser dialog
public void changeColor(Color colorFrom, Color colorTo){
try{
int RGBFrom=colorFrom.getRGB();
int colTo=colorTo.getRGB();
for(int i=0;i<bi.getWidth();i++){
for(int j=0;j<bi.getHeight();j++)
{
int RGB=bi.getRGB(i, j);
if(RGBFrom==RGB)
bi.setRGB(i, j, colTo);
}
}
//write the update Picture to an image file called img.png
ImageIO.write(bi, "png", new File("img.png"));
}catch(Exception e){}
}
//The setAdjustment method will be invoked from the Main class so 
//set adjX and adjY values
public void setAdjustment(int x,int y){
adjX=x;
adjY=y;
}
//THe paint method of the Canvas class is able to draw the picture
//when the program loads
public void paint(Graphics g){
if(bi!=null)
g.drawImage(bi,0,0,bi.getWidth(),bi.getHeight(),null);
}
}

//The Main class represents the window interface of the program
//On the interface we place the PictureArea object ia to show the picture
class Main extends Frame{
PictureArea ia;
String filename;
Main(){
selectPicture();
ia=new PictureArea(filename);
setTitle("Edit picture color");
setSize(600,400);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
add(ia,BorderLayout.CENTER);
setVisible(true);
ia.requestFocus();
ia.setAdjustment(ia.getX(), ia.getY());
ia.setBackground(Color.BLACK);
}
//The selectPicture method will be invoked to display file dialog for file selection
public void selectPicture(){
FileDialog fd=new FileDialog(this,"Choose a picture",FileDialog.LOAD);
fd.setVisible(true);
filename=fd.getFile();
if(filename!=null)
filename=fd.getDirectory()+"/"+fd.getFile();
else System.exit(100);
}
}

public class EditPictureColor{
public static void main(String[] args){
new Main();
}
}

For code explanation, please read comments along with the code.

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