Hi all!

im trying to do a real time chroma key

i have started from an example code that i find in the GSVideo Library

1. import codeanticode.gsvideo.*;
2. // Size of each cell in the grid
3. int cellSize = 1;
4. // Number of columns and rows in our system
5. int cols, rows;
6. // Variable for capture device
7. GSCapture video;
8. void setup() {
9.   size(1280, 720, P3D);
10.   //set up columns and rows
11.   cols = width / cellSize;
12.   rows = height / cellSize;
13.   colorMode(RGB, 255, 255, 255, 100);
14.  
15.   // Uses the default video input, see the reference if this causes an error
16.   video = new GSCapture(this, 1280, 720);
17.   video.start();
18.   background(0);
19. }
20. void draw() {
21.   if (video.available()) {
22.     video.read();
23.     video.loadPixels();
24.    
25.     background(0, 0, 255);
26.     // Begin loop for columns
27.     for (int i = 0; i < cols;i++) {
28.       // Begin loop for rows
29.       for (int j = 0; j < rows;j++) {
30.         // Where are we, pixel-wise?
31.         int x = i * cellSize;
32.        int y = j * cellSize;
33.         int loc = (video.width - x - 1) + y*video.width; // Reversing x to mirror the image
34.         // Each rect is colored white with a size determined by brightness
35.         color c = video.pixels[loc];
36.       if (red (c) > 70) {
37.         stroke (c);
38.         point (i, j);
39.       }
40.       }
41.     }
42.   }
43. }