Computer graphics involves using a computer to produce and manipulate visual images. Graphics hardware is needed for both input and output of graphical information. Common graphics input hardware includes mice, tablets, joysticks, light pens, and trackballs which allow a user to indicate positions on a screen and interact with digital images. Scanners are also input devices that allow physical images and photos to be brought into digital form for editing and manipulation on a computer.

1. GRAPHICS HARDWARE
(INPUT DEVICES)

2. COMPUTER GRAPHICS
The use of a computer to produce and
manipulate pictorial images on a video screen,
as in animation techniques or the production
of audio visual aids
The term computer graphics includes almost
everything on computers that is not text or
sound. Today almost every computer can do
some graphics, and people have even come to
expect to control their computer through
icons and pictures rather than just by typing.

3. EXAMPLES OF COMPUTER
GRAPHICS

5. GRAPHICS HARDWARE
Creating and editing computer graphics requires
specialized software and high-performance
hardware,
Graphics hardware is both for input and output.
hardware which allows graphical information to
be entered directly to the system, Those
hardware are called Graphics Input Hardware.

6. Locators are the devices which gives position
information. The computer receives from a
locator the coordinates for a point using a locator
we can indicate a position on the screen.
Locators
Joystick
TabletMouse

7. JOYSTICK
A joystick has two
potentiometers,
they have been
attached to a
single lever.
Moving the lever
forward or
backward changes
the setting on one
potentiometer.

8. MOUSE
An input device that
enables you to edit and
manipulate images. For
example in terms of
computer graphics, the
mouse can be used to
crop an image or to use
the magic wand tool
etc.

9. TABLET
A tablet composed of
a flat surface and a
pen like stylus or like
tablet cursor
The tablet is able to
sense the position of
the stylus.

10. Selector devices are used to select a particular
graphical object a selector may pick particular item
but provide no information about that item is
located on the screen.

11. LIGHT PEN
An input device that
allows you to draw on a
screen with greater
positional accuracy,
similarly to how you
would on a graphics
tablet it can also be
used to point at
displayed objects

12. KEYBOARDS
The keyboard is an efficient device for
inputting such non graphic data. Cursor
control keys and function keys are common
features on general purpose keyboards.
Additional a numeric keyboard is often
included on the keyboard for fast entry of
numeric data.

13. TRACK BALLS
The track ball are an input device which is
usually used with CAD workstations.
Trackballs are used to accurately draw on
the computer trackballs and spaceballs are
mainly seen or used for games.

14. SCANNERS
An input device that allows you to scan in
images posters photographs etc. which can
then be uploaded and edited in a graphic
software package

15. TOUCH PANELS
Touch panels
allow displayed
objects or
screen positions
to be selected
with the touch of
a finger.