1. scanners

2. Introduction
 Scanner is a device that translates hard copy into soft
copy.
 It translates data on a sheet of paper to a form that
can be stored on a computer.
 In other words converting of a document into digital
format.
 Data can be in either form of text or graphics.

3. Types of Scanners
 Flatbed Scanners.
 Sheet Fed Scanners.
 Slide Scanners.
 Drum Scanners.

4. Most widely usd scanner. Different kinds of scanners.
 Flatbed scanners also
known as desktop
scanners.
 Similar to Xerox
machine.
 The image or document
must be placed face
down on the glass plate
of the scanner.
Flatbed Scanners

5. Sheet Fed
Scanners
This scanner is used for
scanning sheets of
papers.
Sheet Fed scanner is
versatile in scanning.
It can not scan bound
documents.
We can not scan books.
Document should be
fed into the scanner.

6. Slide Scanners
We can scan photo slides
with the help of a slide
scanner.
The basic use of these
scanners is digitalization
of photographs.
Cost and effectiveness
of scanning is high.

7. The costly scanner High application scanner
 Drum scanners are used
for high quality
applications.
 Drum scanners use a
Photomultiplier
Tube(PMT).
 Photomultiplier tube is a
vacuum tube that
converts light into
electrical energy.
Drum Scanners

8. Parts of scanner
 Front panel of a
scanner.
 Scanner cover.
 Rear panel of scanner.
 Fluorescent lamp.
 Stepper motor and
belt.
 Stabilizer bar.
 Mirrors with lens
assembly.

9. Front panel of a scanner
The front portion of a
scanners contain a
power indication light,
the light blinks when a
scan is in progress.
Some scanners also have
a power on/off button
that is used to turn on
the scanner.
Connector LED’s.
Parallel
USB
Access point.

10. Made up of with a glass. Must be kept dust free and dry
 The scanner cover
protects the scanning
surface from dust and
other external particles.
 The cover holds
documents and images in
in place during the
scanning operation.
 It provides a background
for the scanning process.
Scanner cover

11.  The back panel of the
scanner contains
different ports for
connecting the scanner.
 The power port connects
the scanner to the power
outlet.
 The other port connects
the scanner to the
parallel, USB, Fire wire
or SCSI port of the
computer.

12. Fluorescent lamp
The light that is shines
on the paper reflects
back.
Scan head comprises of
mirrors, lens, filter.

13. Security of the scanner.
 A stabilizer bar enables
that the movement of
scan head along the
document smoothly.
 The scan head captures
the light reflected from
the document.
 It acts as a back bone
to the scanner.
Stabilizer bar

14. Types of scanner connectors
 Parallel scanner.
 USB scanner.
 Fire wire scanner.
 SCSI scanner.
 Wire less scanner.
 Network Scanners

15.  We must configure the scanner according to the
instructions in the manual.
 proper configuration of the scanner ensures better
scanning results.
 You may not have to configure the scanner if it is an
automatically detected plug and play device.
 If scanner is manually detected, you may have to
further configure it manually.

16.  Calibration of the scanner eliminates the need to edit
images that looks improper.
 It is good to calibrate the scanner once in a month.
 Calibration prevents scanned images from looking
different as compared to printed images and the
image on the monitor are all identical.
 Calibration is a method to scan an image and then
make corrections.

17. Steps in a scanner calibration
1. Scan an image.
2. Compare the colors
on the scanned
image to the original
color of the image.
3. Build a profile that
corrects the scanners
production of colors.
4. Refer to manual.
5. Set profile as
scanner profile.

18. THANK
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