Resize sketch error

[clab]

@kfrajer thank you so much for your help with this! I very much appreciate your help! Down below I have attached my latest code. This is able to resize and everything but now I have an error of which it is not centered. I have my hand raised but it is not showing so because that part of the screen seems to be missing of some sort. I have also attached the photo below again. Thank you again.

import SimpleOpenNI.*;
import processing.opengl.*;
SimpleOpenNI kinect;

int closestValue;
float minT = 500;
float maxT = 2000;
PImage img;
PImage cam;

// declare global variables for the
// previous x and y coordinates
int previousX;
int previousY;

int blob_array[];
int userCurID;
int cont_length = 1450*1250;

color c1;
color c2;
float textColor = 0;
PFont metaBold;

void setup(){
  size(1450, 1250);
  //size(1920, 1280);
  frameRate(20);
  surface.setResizable(true);
  noStroke();
  kinect = new SimpleOpenNI(this);
  kinect.enableDepth();
  kinect.setMirror(true);
  kinect.enableUser();
  colorMode(HSB, 100);
  img = createImage(1450, 1250, RGB);
  img.resize(640,640);
  smooth();
  blob_array=new int[cont_length];
  c1 = color(random(36), 255, 255);
  c2 = color(random(36), 255, 255);
  metaBold = createFont("GOTHAM-BOLD.TTF", 20);
  //image(img, 0, 0, width, height);
}

void draw(){
  background(0);


  kinect.update();
  img.loadPixels();
  //image(img, 0, 0);
  
  cam = kinect.userImage().get();
  image(cam, 0, 0, width, height);
  int[] depth = kinect.depthMap();

  float sumX = 0;
  float sumY = 0;
  float totalPixels = 0;

  int[] userMap =null;
  int userCount = kinect.getNumberOfUsers();
  if (userCount > 0) {
  userMap = kinect.userMap();
  }



    for(int y = 0; y < 480; y++){
      for(int x = 0; x < 640; x++){
        float n = map(y, 0, 480, 0, 1);
        // randomized gradient color
        if (second() % 10 == 0) {
          c1 = color(random(36), 255, 255);
          c2 = color(random(36), 255, 255);
        }
        color newc = lerpColor(c1, c2, n);
        stroke(newc);
        //line(0, y, img.width, y);
        int offset = x + y * 640;
        int d = depth[offset];

      // min and max threshold that is set
        if(d > minT && d < maxT && x > 100){
          img.pixels[offset] = newc;

      // if there is no user detected
        if (userMap != null && userMap[offset] > 0) {
          userCurID = userMap[offset];
          blob_array[offset] = 0;

          //fill(200,0,200);
        }

          closestValue = d;
          sumX += x;
          sumY += y;
          totalPixels++;
        } else {
      // makes background black
          img.pixels[offset] = color(0);
      }
    }
   }
   // updates the img pixels
    img.updatePixels();
    image(img, 0, 0,width, height);
    // get center of mass of a user
    //float avgX = sumX / totalPixels;
    //float avgY = sumY / totalPixels;

    IntVector userList = new IntVector();
    kinect.getUsers(userList);
    for (int i=0; i<userList.size(); i++) {
      int userId = userList.get(i);
    // get center of mass of a user
    PVector position = new PVector();
    kinect.getCoM(userId, position);
    // rainbow text color
    textSize(20);
    if (textColor >= 255) {
      textColor=0;
    } else {
      textColor++;
    }
    kinect.convertRealWorldToProjective(position, position);
    textFont(metaBold);
    text("you're hot", position.x, position.y);
    fill(textColor, 255,255);
  }
}