 We're sitting in front of a color television that's connected to a computer. This is a program called PAINT that we've written to demonstrate a variety of things you can do with this kind of device. It's called a raster scan machine. And I thought I'd just show you some of the things we can do. Let me begin by watching the picture and pointing out some of these buttons at the time. This little square means that this button is the one that's currently involved and this button lets me take a color and put it into the picture so I can pick up this color blue. Now notice that the squirrels move to the square that I'm in. This line lets me, this button lets me draw a line. We call it program PAINT, somewhat affectionately. It's like PAINT, it's in an electronic medium. Each spot on the screen, each pixel, as they're called, is stored as a series of bits. In this case about six bits. And each bit is changed one by one by one. Now the way I'm doing it is via this little plug here, which has a couple of buttons on it that I've been using this button. If I don't like the modes that I have up top, I can pull off of this menu or another set, say this grand set, and press this little button here. And that will call up to the screen in a new set of buttons. This color set is something I just happened to have started out with. The rainbow is in fact what I happened to like. But if you don't happen to like this particular set, you can define whatever set you like and come in with it. You can also store a image conveniently on a disk. So whatever work you're doing is not lost. Here what I can do there is I can pick a particular color that I want to edit. Let's say this green in here. And what I do is I get a sample punch here of these sliders across the bottom of the screen, which indicate the relative intensity here in the saturation of the image. So here I can vary every instance of that particular color green that appears in the image. And you'll notice that every little spot on the screen is varying as well. That's all there is to it.