The document discusses various types of computer input devices. It begins by explaining what a logo is and its main purpose of being immediately recognizable. It then discusses different input devices including keyboards, mice, light pens, graphic cards, data gloves, and graphic tablets. For each device it provides details on what it is, how it works, advantages and disadvantages. The keyboard section for example describes different keyboard types like ergonomic and wireless keyboards and how they work.

1. Graphic Design
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Lesson6 Input

2.  What Is A Logo?
 To understand what a logo is, we first must
understand what the main purpose of
logos is. The design process must aim to
make the logo immediately recognizable,
inspiring trust, admiration, loyalty and an
implied superiority. The logo is one aspect
of a company’s commercial brand or
economic entity, and its shapes, colors,
fonts, and images usually are strikingly
different from other logo in the same
market niche. Logos are used to identify.

3. Logo ?
 Logo , Logo. Logo , , , . Logo . , , Font Logo .
3

4. Keybo
ard
Mouse
Light
Pen
Graphi
c Cards
Data
Glove
Graphi
c
Tablet

5. Keyboard
 Invented 100 years agoUsed to type data into the
computer
 Most common input device today
 Has special keys for giving the computer commands
 Commands tell the computer to do something, like save
the file
 These special keys are called command or function keys
 There is no specific standard but we have stuck to the
qwerty keyboard
 Different types of keyboards
 It depends what we need to input
 ATM keyboard, piano keyboard, alarm system
keboard etc

6. Types of Keyboard
 There are following types of Keyboards:
1. ERGONOMIC KEYBOARD
 The artifact of this keyboard is slightly broader and
different in shape, when compared with the normal
keyboard.
 In this key board certain space will be existing
between the two sets of keys and the countered
shape of this key board allow the users to place their
hands in the natural position to type.
 These key boards are mostly used by the people who
often work with the key board as their usage is easier
and is less stressful for the wrist. The following figure:
Ergonomic keyboard shows how the set of keys are
separated with gaps in between.

8. Types of Keyboard(Cont’d)
2. Wireless Keyboard
 A wireless keyboard, the name itself doles the
meaning that this keyboard can be operated without
addressing a wired connection to the processor.
 The wireless keyboards are also referred as Cordless
keyboards; these keyboards require batteries to
provide the electricity which usually delivered through
a PS/2 or USB cable. “AA” or “AAA” batteries are most
widely used standard batteries for wireless keyboards.
 Apple Macs are known to revolutionize the wireless
keyboard by making them thinner than the wired
ones. These keyboards usually work at 2.4 GHz
frequency and come with a dongle that connects
and makes them communicate with the computer.

10. Working of Keyboard

11. Advantages of Keyboard
 You may chat with other players if in an online
game such as World of Warcraft, Runescape,
Toontown, and the like. Relatedly, some games
require a keyboard to play. You may enter
information into databases (Such as WikiPedia,
WikiAnswers)
 Homework, schoolwork, or work-work can be done
neatly using keyboard-required software.
(Microsoft word, notepad)
 The use of a keyboard can enable shortcuts with
some programs. Any information that needs to be
entered into a computer, network, and/or etc.
can be added with, usually, ease.

12. Disadvantages of Keyboard
 Keyboards can add up in price. Wireless
keyboards can get up to, but are not limited
to, $125.
 If not wireless, keyboards can add another
wire (or more) to a bulk of other wires, making
any workspace messy(confused).
 If wireless, there may be very slight
interference on some rare frequency
channels. Multiple wireless keyboards may
cross paths if settings are not set up correctly.
(Resulting in as tunned, confused user)

13. Mouse
A pointing device that fits
comfortably under the palm of your
hand
The most widely used pointing
device on desktop computers
The mouse controls the movement
of the pointer, also called the mouse
pointer, on the screen

14. How does a mechanical mouse
work?
 A rubber or metal ball is
on its underside
 When the ball rolls in a certain
direction, electronic circuits in
the mouse translate the movement
of the mouse into signals the
computer understands
 A mouse pad provides better
traction and protects the ball
from a build up of dust and dirt
mouse
buttons
mouse
buttons
wheel
button
wheel
button
ballball

15. How does an optical mouse
work?
Uses devices that emit & sense light
to detect the mouse’s movement
Some use optical sensors; others
use laser
More precise than a mechanical
mouse & does not require cleaning
Slightly more expensive
optical
sensor
optical
sensor
forward
button
forward
button
back
button
back
button
wheel
button
wheel
button

16. Advantages of Mouse
 Can be installed without any installation
software.
 Mouse scroll is actually interchangeable.
a. Free scrolling pertaining to web
browsing
b. Just click scrolling for choosing weapons
and even potions

17. Disadvantages of Mouse
 They need a flat surface to be used, or
else they won't function.

18. Light Pens
 A light pen is a pen-shaped input device.
 A light pen utilizes a light sensitive detector, requiring you to
hold a pen and point it at the screen.
 The device contains a light sensor which, when pointed at a
cathode ray tube screen, generates a signal each time the
electron beam raster passes by the spot the pen is pointing
at.
 Light enters the lens of a light pen, where it encounters a
photoelectric cell, which converts the energy to a signal
that is sent to the computer. The light is obtained from the
refresh of the CRT, and at the instant the light is generated,
the computer knows what location on the screen is being
refreshed; this information is coordinated with the signal
from the light pen, and is subsequently used by the graphics
software to make a decision.

20. Advantages of Light Pens
 Allows you to select objects on a display screen -
It has great accuracy-drawing directly on the
screen so it is more accurate-more precise
 Durability and Accuracy : The light pen and
computer respond instantly when you move it or
click on one of the buttons located on the pen's
sides. The tip cannot damage the computer
screen in any way.
 Flexibility: In addition to having the full range of
mouse options, including allowing you to drag and
drop, you can use the light pen to directly draw or
write on the screen. This makes providing your
signature relatively simple.

21. Advantages of Light Pens
 The amount of work space is reduced
when you use a light pen instead of a
mouse because you do not need a flat
surface to operate a light pen.
 Maintenance and Value :Buying a light
pen to use on your CRT computer monitor
is cheaper than buying a touch-screen
monitor. The same is true for repairs or
replacements.

22. Disadvantages of Light Pens
 Light pens have the advantage of
'drawing' directly onto the screen, but this
can become uncomfortable, and they
are not as accurate as digitizing tablets.
 Light pens normally require a specially
designed monitor to work with.

23. Graphic cards
 A graphics card, also known as a video card, is a piece of
hardware installed in a computer that is responsible for
rendering the image on the computer’s monitor or display
screen.
 Graphics cards come in many varieties with varying
features
 The first consideration when buying a graphics card is to be
sure it is capable of displaying the best resolution the
monitor can support. For Liquid Crystal Display (LCD)
monitors this means supporting the native resolution.
Cathode Ray Tube (CRT) monitors do not have a native
resolution. In this case, ensure the card is capable of
supporting the highest resolution, even if the CRT monitor
will be frequently used at lower resolutions.

24. Graphic cards
 The second consideration is on-board
memory. A graphics card must work very hard
to render images to the screen. Unlike text
files, graphics images are much larger files
consisting of great amounts of data that must
be processed by the graphics or video card. A
faster card has its own resident memory chips
to perform this function so as not to impinge
upon the system’s Random Access Memory
(RAM). Less robust cards have less resident
memory and require sharing system RAM to
process images.

25. Advantages of Graphic Cards
 The advantage of a graphics card is that it allows
you to hook up a monitor and see what your
computer is doing.
 More room to run applications in, less scrolling side
to side and up and down in your windows, more
colors (this isn't necessarily true, but it is a closely
related topic, and I'll address this issue below),
more colors means nicer looking pictures (ever
notice that annoying color banding (called
dithering) in most of the pictures you look at), A
much less cluttered appearance (unless you're
one of those people who upon getting more
space, feels the need to fill it up).

26. Disadvantages of Graphic
Card
 The disadvantage is that your computer wont work
without one.
 With higher resolutions and colors, there is a
performance hit (speed), which could be big or small
depending on your hardware and the resolution you
set up (generally it's a very small performance hit). This
is due to the fact that there is much more information
to deal with as well as more pixels to update on-
screen (I'll get to this below), The higher you set your
resolution, the smaller your icons and text, and your
refresh rate drops (I'll get to this too).

27. Data Glove
 Data Glove is a device to interact with animated artificial objects.
Consider a glove fitted with sensors and electrical wires hooked to a
glove compatible computer.
 Here, we can see our hand inside the glove in the display monitor of
the computer. As we rotate or move our hand and manipulate our
fingers, we can see our hand inside the glove in the display monitor
of the computer. Consider further that a graphic object is described
in the monitor. The object may be animated. It may even be a
scaled replica of a real life object.
 Now , if we try to move our hand in space in such a way that the
image of our hand in the display manipulates the graphic object in
the screen, we shall have a strange feelings. With out actually
touching anything, we may distort the shape of the object using the
image of our hand inside the dataglove! This glove act as an agent
to transport the user to an artificial domain.

28. Data Glove

29. A graphics tablet is a computer input device that enables a user to hand-draw
images and graphics, similar to the way a person draws images with a pencil and
paper.
These tablets may also be used to capture data or handwritten signatures.
It can also be used to trace an image from a piece of paper which is taped or
otherwise secured to the surface.
Capturing data in this way, either by drawing or entering the angles of linear poly-
lines or shapes is called digitizing.
The device consists of a flat surface upon which
the user may "draw" or touch an image using an
attached stylus, a pen-like drawing device.
The image generally does not appear on the
tablet itself but, rather, is displayed on the
computer monitor.

30.  Easy way to control a computer
 Easy way to draw a scale image on a
computer
 better quality of image
 More effective than mouse input.
 Can input pressure data for use in a
graphics package

31.  Touch screens break easily
 The stylus pens can be easily lost therefore the graphics
tablet
will not work
 slower then paper drawing Can be awkward to access
menus and make selections Larger designs (A4 for example)
are expensive
 More expensive than a mouse, especially in the larger sizes.
 Not as precise as a mouse for menu control, so it tends to
be an addition rather than a replacement
 Graphic tablets are rather like electronic tracing paper
and, like paper ,they one in all sizes from a modest A4 size to
a very large A0 size which will occupy the best part of a
desk.

32. Graphical Tablet

33. Thank you..!!