Thread: help with java color code

So I am very new to java in general, but I have this code here:

import java.awt.Color;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
 
public class FindColor
{
    private static Rectangle rectangle = new Rectangle(800, 600);
 
    public static void main(String[] args) throws Exception
    {
        Robot r = new Robot();
        BufferedImage image = r.createScreenCapture(rectangle);
        search: for(int x = 0; x < rectangle.getWidth(); x++)
        {
            for(int y = 0; y < rectangle.getHeight(); y++)
            {
                if(image.getRGB(x, y) == Color.BLACK.getRGB())
                {
                    r.mouseMove(x, y);
                    System.out.println("Found!");
                    break search;
                }
            }
        }
    }
}

and it does exactly what it's supposed to do, however, let's say I already have the RGB values of a color I want to search for, what do I modify to make that work? I know it seems so simple but I get confused with the part that shows this:

  if(image.getRGB(x, y) == Color.BLACK.getRGB())

AND I want the code to basically be something like this:

  if(image.getRGB(x, y) == MYRGBVALUES) {
do blank;
}

Basically want I am trying to do here is.. instead of it searching for the built in color.black.getrgb, I want it to search for the 3 rgb values(ex. 155, 112, 124) that I already have in my notes.

The BufferedImage class's getRGB method returns an int array. So your problem is how to compare the contents of two arrays. Look at the Arrays class for a method to compare the contents of two arrays.

Look at the API doc for the BufferedImage class's getRGB method to see what it returns.

Build an array with the values you want to compare against.

Then look at the Arrays class's methods for comparing the contents of arrays.

You could write a method that takes the image and the RGB values. It would search through all the pixels in the image looking for matches with the RGB values passed to it. I'm not sure what the method would return. You need to describe what you want it to do if if finds a match or not.

The BufferedImage class has two getRGB() methods. The one getRGB(x,y) returns an int in the form of an RGB value. Comparing ints is more straightforward than comparing arrays so I would stick with that. The Color class provides a constructor to convert R,G, and B values to an int. Or you can employ a simple shift and or construct. As Norm says, passing an array of RGB values and the image would be one way to go. But scanning an image over and over again is not very efficient. Once you get it working you may want to develop an algorithm to speed up the search (say by doing some sort of pre-processing on the image data that better lends itself to searching). It all depends on your requirements.

Regards,
Jim