import java.awt.*;
class ChromaKey
{
     public static void main(String[] args)                              //start of the main method
    {
        Picture pictureObj = new Picture("SecretMessage.png");     //creates a new Picture object representing the file in the parameter list
        pictureObj.explore();                                           //explore the Picture object which is currently the unaltered original image
        int redValue = 0; int greenValue = 0; int blueValue = 0;        //declare and initialize the variables that hold the red, green, and blue values (0-255)

        Pixel targetPixel = new Pixel(pictureObj, 0,0);                //set the coordinate for the image origin
        Color pixelColor = null;                                        //declare a Color object and set its initial value to null (or nothing)

        for(int y=0; y < pictureObj.getHeight(); y++)                   //outside nested loop to traverse the image from top to bottom
        {
            for(int x = 0; x < pictureObj.getWidth(); x++)              //inside nested loop to traverse the image from left to right
            {
                targetPixel = pictureObj.getPixel(x,y);                 //gets the x,y coordinate of the target pixel
                pixelColor = targetPixel.getColor();                    //gets the color of the target pixel

                redValue = pixelColor.getRed();                         //assign the red component (0-255) of the target pixel to the redValue variable
                greenValue = pixelColor.getGreen();                     //assign the green component (0-255) of the target pixel to the greenValue variable
                blueValue = pixelColor.getBlue();                       //assign the blue component (0-255) of the target pixel to the blueValue variable

              int redColor= 8;
              int greenColor= 0;
              int blueColor= 0;

              int redColorReplace=255;
              int greenColorReplace=0;
              int blueColorReplace=0;

              if(redValue==redColor && greenValue==greenColor && blueValue==blueColor)
                {
                 redValue=redColorReplace;
                 greenValue=greenColorReplace;
                 blueValue=blueColorReplace;
                  }
                pixelColor = new Color(redValue, greenValue, blueValue);//assign the color of the pixel
                targetPixel.setColor(pixelColor);                       //sets the new color of the target pixel
            }//end of the inner for loop
        }//end of the outer for loop