Creating a scaleUp main method in a new class

So I'm trying to create a class with a method called ScaleUp which basically scales a .jpg file by a certain amount. So far I have:

Code :

import java.util.*;
public class ScaleUp
{                 
public static void main(String[] args) {
  /*  HERE FROM PREVIOUS ATTEMPT:*/
   Scanner sc = new Scanner(System.in);
   System.out.print("File: ");
  String fileShortName = sc.next();
  String fileName = "/C:/Users/Umar/Desktop/Comp Sci/Dr. Java Add Ons/mediasources/" +
  fileShortName + ".jpg";
  System.out.print("Scale: ");
  int numTimes = sc.nextInt(); 
  Picture pictObj = new Picture(fileName);
 
}
public static Picture scaleUp(int numTimes)
  {
  String fileName = FileChooser.pickAFile();
  Picture origPic = new Picture(fileName);
 
    Picture targetPicture = 
      new Picture(origPic.getWidth() * numTimes,
                  origPic.getHeight() * numTimes);
    Pixel sourcePixel = null;
    Pixel targetPixel = null;
    int targetX = 0;
    int targetY = 0;
 
    for (int sourceX = 0;
       sourceX < origPic.getWidth();
       sourceX++)
    {
        for (int sourceY=0;
        sourceY < origPic.getHeight();
        sourceY++)
    {
          sourcePixel = origPic.getPixel(sourceX,sourceY);
 
       for (int indexY = 0; indexY < numTimes; indexY++)
      {
         for (int indexX = 0; indexX < numTimes; indexX++)
        {
          targetX = sourceX * numTimes + indexX;
          targetY = sourceY * numTimes + indexY;
          targetPixel = targetPicture.getPixel(targetX,
                                               targetY);
          targetPixel.setColor(sourcePixel.getColor());
        }
      }
    }
  }
 
  return targetPicture;
 
}
 
}

However, when I run the program I can use scanner to input information it accepts the info but no picture file is shown. Can someone please show me how I can get the program to actually spit out the picture that the method is invoked on?