How to remove all color except a certain rgb value

Question

Okay I need to get the program to scan the screen for a certain rgb value then change it to bright pink. I made the program and so far it scans the screen for a certain color. I do not know how to get it to change the pixel color. I think I need to upload a picture instead of having it scan the screen. But if I do that I still wouldn't know how to change the pixels.

Here's my code so far.

import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.WritableRaster;


public class FindRgbOnScreen extends Thread{

    public Rectangle captureSize;

    public FindRgbOnScreen() {
        captureSize = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
    }

    public void run() {
        try {
            Robot robot = new Robot();

            while(true){
                BufferedImage img = robot.createScreenCapture(captureSize);
                WritableRaster r = img.getRaster();
                DataBuffer db = r.getDataBuffer();
                DataBufferInt dbi = (DataBufferInt)db;
                int[] data = dbi.getData();                 

                for (int x_scale = 0; x_scale < captureSize.width; x_scale += 1) {  //this scans the screen 
                    for(int y_scale = 0; y_scale < captureSize.height; y_scale += 1) {
                        int rgb = data[x_scale + captureSize.width * y_scale];
                        if (rgb == -5381164){
                            //change pixel to pink
                        }
                        else{
                            //change pixel to grey
                        }
                    }
                }
            }
        }
        catch(AWTException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new FindRgbOnScreen().start();
    }
}

Just iterate over the image and change all rgb that you want to magenta? — mwerschy, Jun 01 '13 at 20:58
You should attempt to solve the problem yourself, then come back if you have specific questions. StackOverflow isn't a code writing service. — greedybuddha, Jun 01 '13 at 21:04
i didn't know if there was a picture editor out there that already could do this. — Luke Worthing, Jun 01 '13 at 21:05
OK, what does your code currently do? What does it not do? What errors are you seeing? etc... — Hovercraft Full Of Eels, Jun 01 '13 at 21:23
And is it your code? If not, where is it from? Do you understand it? — Hovercraft Full Of Eels, Jun 01 '13 at 21:29
I started with a little of someone else's code then added more myself but I completely understand it. It currently scans the screen for a color and once it finds that color I can make it do something (ex. move the mouse to that color). There are no errors I just don't know how to do what I want to get done. — Luke Worthing, Jun 01 '13 at 21:41

score 0 · Answer 1 · edited May 23 '17 at 11:57

0

Have a look at these posts. You should use ColorModel which is the fastest way to do pixel color replacement instead of iterating over pixels:

edited May 23 '17 at 11:57

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answered Jun 01 '13 at 21:45

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How to remove all color except a certain rgb value

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