updates the number ie from Pixie300.jpg to the next one being pixie301.jpg

Do you mean this:

1. if (framecount>5)
2.        saveFrame("Pixie"+str(300+framecount) + ".jpg");//

hay man i have changed the framecount to a int n but how do i go about so that the n number keeps updating itself ie add 1 to it 

Framecount is a build-in var and gets increased automatically.

Is this what you're looking for?:

void setup() {
  frameRate(6);
}

void draw() {
  background( (color) random(0x1000000) | #000000 );

  if (frameCount % 6 != 0)    return;

  saveFrame("Pixie" + (299 + frameCount/6) + ".jpg");
  print(299 + frameCount/6 + "\t");
}

 i am attempting to extract colours from a series of images, to show the color scheme of a movie like cinema redux, ive got the images its just that i need to process them through this program so it extracts the pixels and shows them, but am having some trouble as the process manually takes a bit long and due to laziness want an automated method of extracting color from these images

I really don't get it! In my example, anything past statement:

if (frameCount % 6 != 0)    return;
is run once each 6 draw() executions!

You keep saying -> load every 6th frame. I understand frame as a draw() run!
If it's not it, you have to explain it better!