import processing.video.*;
MovieMaker mm;
PGraphics alphaImage;
int startFrame = 1; //set this..
int endFrame = 112;//.. this..
String fileNamePrefix = "frame-" ; //.. and this (example for "frame-1234.png or frame-0001.png" 
String fileTypeSuffix = ".png" ;
//note this is setup for png but anything I think tiffs are supported too (jpgs work as well but contain no alpha info)

PImage img;
int currentFrame;

void setup()
{
  size(512, 200); //..oh yeah and this - frame size goes here
  colorMode(HSB,255);
  currentFrame=startFrame-1;
  mm = new MovieMaker(this, width, height, "imageSequencedMovie.mov", 24,  MovieMaker.ANIMATION, MovieMaker.HIGH,24); //24
}

void draw()
{
  currentFrame++;

  
  
    image(loadImage(fileNamePrefix+ nf(currentFrame,4) +fileTypeSuffix), 0, 0, width, height);
    alphaImage = createGraphics(width, height, P2D);//frame size could be set here too (including shrinking expanding etc)
    alphaImage.beginDraw();

 
    loadPixels();
    alphaImage.loadPixels();
    float h,s,b;
    for (int i=0; i<pixels.length; i++)
    {
     h=hue(pixels[i]);
     s=saturation(pixels[i]);
     b=brightness(pixels[i]);
     if (b>0) alphaImage.pixels[i]=color(h,s,b,255);
     else alphaImage.pixels[i]=color(h,s,b,0);
     // re-use the brightness value as the alpha --
     // (since the pixel array, strictly speaking,
     // does not contain alpha values (whoops.)
     // in this example, if the brightness is 0,
     // use 0 alpha, otherwise use full alpha.
    }
    alphaImage.updatePixels();
    alphaImage.endDraw();
    
    println(fileNamePrefix+"_alpha"+ nf(currentFrame,4) +fileTypeSuffix);
    //mm.addFrame();
    mm.addFrame(alphaImage.pixels,width,height); //save movie
    //alphaImage.save(fileNamePrefix+"_alpha"+ nf(currentFrame,4) +fileTypeSuffix); //save individual frames
  

  if(currentFrame==endFrame)
   {
     println("done");
     mm.finish();
     exit();
   }
}