Incorrect image alignement

[David Lewin]

I'd like to display colour onto 4 strips. 

However , this simple script works only for 3 as the 4th strip is blinking in white (and the display is so small as well)

OPC opc;

PImage im;

float zoom = 1;

final static float inc = .05;

void setup()

{

  size(80 ,80);

   im = loadImage("test.png");

  opc = new OPC(this, "127.0.0.1", 7890);

  opc.ledGrid(0, 64, 4, width/2, height/2, width / 80.0, height/80.0, 0, false);

  

}

void draw()

{ 

  

  image(im, width/10,height/2);//, width, imHeight);

 

}

Any clue ?

[David Lewin]

by " works only for 3 " I mean 1 is red, 1 is blue, 1 is green