hi,
I'm trying to use pixel arrays and PImage for the first time--I made a short test sketch to explain my question.


PImage img;
int counter = 0;

void setup() {
 size(400,400);
 img = new PImage(width,height);
 for (int i=0; i<img.pixels.length; i++) { // initialize img's pixels to white
   img.pixels[i] = color(255);
 }
}

void draw() {
 background(255);
 img.pixels[counter] = blend(img.pixels[counter],color(0,140,0),BLEND); // mix in green, one pixel per call to draw()
 if (counter>100) {
   image(img,0,counter/10);
 }
 counter++;
}


what confuses me is that it seems to ignore the updating of img.pixels once image() has been called for the first time. Why would this happen?

Or: what's the right way to make incremental changes to a pixel array behind the scenes and redraw the whole thing on every draw()?

thanks,
Neil

I love questions with simple answers. Thanks!