Recitation 10: Workshops – Ariana Alvarez

For this week’s recitation, after the map() function workshop, I chose to attend the media manipulation workshop, as it was what aligned the most with my project. What I wanted to work on in this workshop, was to learn how to manipulate pixels in webcam. 

Initially, I attempted to change directly the RGB colors in the webcam, as during the workshop I was told that there may not be the possibility of adding a filter to it (similar with an image). As this process wasn’t being effective in creating a negative image effect,  I did some research and it was possible to add filters to webcam with cam.filter() function. 

After adding an inverse black and white filter effect on the webcam, I also attempted to make the image brighter and darker by manipulating the HSB values of the pixels. It was quite challenging, however this media manipulation workshop provided me with a better head-start towards my project and allowed me to explore further ways in which pixels could be manipulated in webcam through processing. 

The code was the following:

//int r = 50;
//int g = 50;
//int b = 50;

import processing.video.*; 
Capture cam;

//color invertColor( int r, int g, int b) {

//  return color(255 - r, 255 - g, 255 - b);
//}

void setup() {  
  size(640, 480); 
  colorMode(HSB);
  cam = new Capture(this, 640, 480);
  cam.start(); 
} 
 void draw() { 
   
   
   
  if (cam.available()) { 
   cam.read(); 
   image(cam, 0, 0); 
   cam.filter(GRAY);
   cam.filter(INVERT);
      //background(invertColor(r,g,b));
  } 

  cam.loadPixels();
       
//Pixels, code with Arduino Distance Sensor
  noStroke();
  int rectSize = 10;
  int w = cam.width;
  int h = cam.height;
  
  for (int y = 0; y < h; y+=rectSize) {
    for (int x = 0; x < w; x+=rectSize) {
      int i =  x + y * w;
      
      fill( cam.pixels[i] );     
      rect(x, y, rectSize, rectSize);
      
      
    //for (int y = 0; y < h; y++) {
    //  for (int x = 0; x < w; x++) {
    //    int i =  x + y*w; // *** IMPORTANT ***
    
        float b = brightness(cam.pixels[i]); 
        float s = saturation(cam.pixels[i]);
        float u = hue(cam.pixels[i]);
        float ch = map(mouseX, 0, 255, height, width);
        cam.pixels[i] = color(u, s, b+ch); 
     
      }
   
    cam.updatePixels();
  }
  }
 //   }
 //}