Transcript William Sawyer - University of Delaware

Output Hardware
Monitors
 Basic Terms:

– smallest element that can be
on a monitor
independently
(dp) - the amount of space between adjacent

The closer the
 Get .22 dp or less
, the crisper the image

– number of

The more
 Expressed in

on a screen
the better the
(dpi)
-the number of bits used to store color

The higher the
 24-bit

the more true the colors
is better than 8-bit
Output Hardware
Monitors

(CRT) is a vacuum tube used in a
computer or terminal display screen
 Big
monitors that resemble TV sets
LCD (
), or Flat panel displays, are
made of 2 plates of
separated by a layer of
that line up to transmit or block light
 Small
flat monitors, like those on a laptop
Output Hardware
LCD Advantages and Disadvantages
LCD advantages

 Use
little
 These
 Don’t
(run
)
2 factors make it
have
(but can have
go bad)
LCD Disadvantages

 More
problems make them less desirable for online
players
than older technologies (CRT)
 Small
 Trouble
with
and good
LCD Monitor: What to look for
 Accurate

 the

measurement of the
you want a ratio of at least
 Brightness
A
and the
(measured in
pixel
and hopefully
)
good level is about

 you
want at least

 the

 Look
amount of time needed for a
to go from
to
you want at least 25 ms and preferably 17 ms.
at Backlight Failure – you want a 3 year warranty
Output Hardware
Video Controller (Video Card)

Card inside your computer that interfaces with the
(e.g.,your
)
 Quality of
relies on video card as much as on quality of
 Video
Cards have their own
 Video Standard
 SVGA
 XGA
 SXGA
 UXGA
 QXGA
(called
) and
 Principal resolution (pixels)
 800
x 600
 1024 x 768
 1280 x 1024
 1600 x 1200
 2048 x 1536
Output Hardware
Printers

-Form characters or images by striking a print
hammer or wheel against an ink ribbon


Use


and
like in photocopiers
Produce crisp, professional pages
- Spray
from 4 nozzles at high speed
Printers –Melts dots of colored
onto paper



Dot matrix printers
Used for book covers, posters, etc.
- A specialized printer designed to produce large highquality graphics in a variety of colors
 The earliest output device that could produce graphics
Output Hardware
Ink jet vs Laser Printer
 Ink Jet
upfront

 Cheaper
 Prints
in
 Photo-quality images (
 But…

Print


(usually 8-20 pages per minute)
need to be replaced often
Look for cartridge
– the higher the
the cartridge holds (19mL better than 4mL)
Cartridges
 Ink
 Ink
 Price per page – about

is at least 360 dpi)
, the more ink
Output Hardware
Ink jet vs Laser Printer
 Laser
more upfront

cost more

printer
 Usually prints in
(unless it’s very expensive)
 But…

(14-30 pages per minute)

600 dpi up to 1800 dpi

don’t need to be replaced very often
 Cartridges don’t
 Ink doesn’t
(very sharp images)
 Ink doesn’t
 Price per page – about 1-3 cents

Print
How to choose a printer

: measured in dots per inch (dpi).


Higher dpi = better
600 dpi means the printer can print 360,000 (600x600) dots in a square inch
 Speed: measured in
 Most printers have different rates for
(ppm):
and for
 Initial


How much is it to replace the ink or toner cartridges
 Printer
 program in the pc that works with printer for printing
 Some just deal with printing, others do things like
adjust individual
, etc.

,
photos,
of paper

The

than
, the better, and the heavier the paper the printer can handle.
(in front, out back) is better than
(in front, out top), which is better
( in front, out front)).