import processing.video.*;

Capture camera;
int[] oldPixels;

void setup()
{
 size(640, 480);
 oldPixels = new int[640*480];
 println(Capture.list());
 camera = new Capture(this, 640, 480, 30);
}

void draw(){
 if (camera.available()) {
   camera.read();
   
   image(camera, 0, 0);

 loadPixels();
 for(int i=0;i<pixels.length;i++)
{
 int c=pixels[i];
 int r=(c>>16)&0x000000FF;
 int g=(c>>8)&0x000000FF;
 int b=c&0x000000FF;
 
 int c2=oldPixels[i];
 int r2=(c2>>16)&0x000000FF;
 int g2=(c2>>8)&0x000000FF;
 int b2=c2&0x000000FF;

 int diffR= r2-r;
 int diffG = g2- g;
 int diffB= b2-b;

 int totalDiff = abs(diffR)+abs(diffG)+abs(diffB);
 float percentDiff = totalDiff/((float) 300.0);
 if(percentDiff>1) percentDiff=1;
 
 int rNew = (int) round(255*percentDiff);
 int gNew = 0;
 int bNew = (int) round( 255 *(((float)1.0) - percentDiff));
 
 oldPixels[i] = pixels[i];
 pixels[i]=0xFF000000|(rNew<<16)|(gNew<<8)|bNew;
}
updatePixels();
}
}