Java Program to Create Channel Selection System Assignment Solution.

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.JFileChooser;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.fxml.FXML;

import javafx.fxml.FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.scene.control.MenuItem;

import javafx.scene.control.TextField;

import javafx.scene.image.ImageView;

import javafx.scene.image.PixelWriter;

import javafx.scene.image.WritableImage;

import javafx.stage.Stage;

import java.awt.image.BufferedImage;

import java.awt.Color;

public class ChannelSelection extends Application {

   @FXML

   private TextField dimensionsTxt;

   @FXML

   private ImageView imgView;

   @FXML

    private MenuItem openMenuBttn;

    @FXML

    void initialize() {

        assert dimensionsTxt != null : "fx:id=\"dimensionsTxt\" was not injected: check your FXML file 'layout.fxml'.";

        assert imgView != null : "fx:id=\"imgView\" was not injected: check your FXML file 'layout.fxml'.";

        assert openMenuBttn != null : "fx:id=\"openMenuBttn\" was not injected: check your FXML file 'layout.fxml'.";

    }

    public void start(Stage primaryStage) throws IOException {

      FXMLLoader loader = new FXMLLoader(getClass().getResource("layout_channelselection.fxml"));

      Parent root = loader.load();

      Scene scene = new Scene(root, 510, 420);

      primaryStage.setTitle("Channel Selection");

      primaryStage.setScene(scene);

      primaryStage.show();

     }

     public static void main(String args[]) {

        launch(args);

     }

     @FXML

     void loadImage(ActionEvent event) throws IOException {

         // pick image

         JFileChooser fileChooser = new JFileChooser();

         int result = fileChooser.showOpenDialog(null);

         if (result == JFileChooser.APPROVE_OPTION) {

            File selectedFile = fileChooser.getSelectedFile();

            //creating the image object

            //InputStream stream = new FileInputStream("garden.jpg");

            BufferedImage image = ImageIO.read(new File(selectedFile.getAbsolutePath()));

            // Get dimensions

            int width = image.getWidth();

            int height = image.getHeight();

            WritableImage wr = new WritableImage(width, height);

            PixelWriter pw = wr.getPixelWriter();

            for (int x = 0; x < width; x++) {

                  for (int y = 0; y < height; y++) {

                     // Get argb

                     int pixel = image.getRGB(x,y);

                     Color color = new Color(pixel);

                     //int alpha = (pixel >> 24) & 0xff;

                     /*int red = (pixel >> 16) & 0xff;

                     int green = (pixel >> 8) & 0xff;

                     int blue = (pixel >> 1) & 0xff;*/

                     int red = color.getRed();

                     int blue = color.getBlue();

                     int green = color.getGreen();

                     // Now, pick brightest

                     // Check if color is almost white

                     if(red >= 200 && green >= 200 && blue >= 200) { // nearly white

                        red = 0;

                        green = 0;

                        blue = 255;

                     } else if (blue <= 50 && red <= 50 && green <= 50) {

                        red = 0;

                        blue = 0;

                        green = 0;

                     } else if (blue >= red && blue >= green) {

                        green = 0;

                        red = 0;

                     } else if (red >= blue && red >= green) {

                        blue = 0;

                        green = 0;

                     } else if(green >= red && green >= blue) {

                        red = 0;

                        blue = 0;

                     }

                     // Now, convert to argb

                     //int argb = alpha << 24 + newcol[0] << 16 + newcol[1] << 8 + newcol[2];

                     int argb = (255 << 24) | (red << 16) | (green << 8) | (blue << 1);

                     pw.setArgb(x, y, argb);

                  }

            }

            //Image image = new Image(stream);

            imgView.setImage(wr);

            //Setting the image view parameters

            imgView.setPreserveRatio(true);

            // Display dimensions

            dimensionsTxt.setText(String.format("Width = %d, Height = %d", width, height));

         }

     }

}