Electronic Paint—1977

Electronic Paint—1977


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 erasing the picture and pointing
out some of these buttons up top. 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 square has moved to this
squiggly line and this line lets me…this button lets me draw a line. We call the 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 all this is via this
little puck here which has a couple of buttons on it, 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 another set, say this grid set, and press this little button
here. And that will call up to the screen a new
set of buttons. This color set is just something I happen
to have started out with, the rainbow is an effect I happen 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 the image conveniently
on disk so whatever work you’ve done is not lost. Here what I can do, though, 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 patch here and I have these sliders across the bottom of the screen, which indicate
the relative intensity, hue, and 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.

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