Video+Flash simulation: How can I improve my code to take+save_frame - load white Img - freeze_img?

Ciao good folks,

For an art installation, I'm working with PS3 eye webcam + processing.

My goal is to have the live view of the webcam, but when the button"S" is pressed the code should:

save the frame --> load a white image to simulate the flash effect, freeze the frame for 1 second, return to live view.

Instead what my code does when button "s" is pressed is:

save frame--> 1 sec freeze image --> white image --> return to live view.

I can not understand what's wrong in my code and how can I change the order of events as whish.

here the code:

    import java.util.ArrayList;

    import com.thomasdiewald.ps3eye.PS3Eye;
    import com.thomasdiewald.ps3eye.PS3EyeP5;

    PS3EyeP5 ps3eye;

    PImage flash;
    int counter = 0;

    void setup() {
      size(640, 480);
      smooth(0);
      flash = loadImage("white.jpg");
      ps3eye = PS3EyeP5.getDevice(this);
      ps3eye.init(60, PS3Eye.Resolution.VGA);
      ps3eye.start();
      frameRate(1000);
    }

    void draw() {
      if (ps3eye !=null) {
        ps3eye.start();
        image(ps3eye.getFrame(), 0, 0, width, height);
      }
    }

    void keyPressed() {
      if ( key == 's' ) {
        String s = "print/" + "microbe" + nf(counter, 4) +".jpg";
        save(s);
        counter++;
        flash();
      }
    }

    void flash() {
      image(flash, -5, 0);
      ps3eye.stop();
      delay(1500);
    }