Using Overhead
Projectors (OHPs)
and
Overhead
Transparencies
(OHTs)
Overhead Projectors
(OHPs) and Overhead
Transparencies
(OHTs)…
provide one of the simplest
technologies to create and use
visual and verbal information in
the training environment…...
Using OHPs and OHTs
But they are
also one of
the most
mis-used!
Using OHPs and OHTs
Overhead Projectors
(OHPs)….
project an image onto a wall or
screen by shining light through
a clear plastic sheet
(transparency) which may have
words and/or images on it.
Using OHPs and OHTs
Overhead
Projectors (OHPs)….
Advantages:
•can be used in any room
where there is electricity and a
white wall or screen
• can show a large image to
be shared by the whole group
Using OHPs and OHTs
Overhead Projectors
(OHPs)….
Disadvantages:
• may need the room to be
darkened - so the image can be
seen
• can create a “one-way”
relationship with the presenter
• can create a nice environment
for people to “shut-off” and go to
sleep! Using OHPs and OHTs
Overhead Projectors
(OHPs)….
Tips:
• keep the glass or projection
surface clean
• make sure you have a spare
bulb
• test it before you use it!
Using OHPs and OHTs
Overhead Projectors
(OHPs)….
Using OHPs and OHTs
OHTs can be made by:
• drawing
directly onto the
transparency
• putting the transparency
through a photocopier
• directly printing onto the
transparency using a laserprinter or an ink-jet printer
• converting slides or
photographs into an OHT
(expensive!)
Using OHPs and OHTs
OHTs can be made by:
• drawing
directly onto the
transparency
Using OHPs and OHTs
You can put your
OHTs in special
folders.. this will:
•protect them from fingerprints and other
marks
• let you put them in a “ring -binder”
• let you put notes on the border or frame
to help you.
Using OHPs and OHTs
Portrait or
Landscape?
Opinions differ on the use of
either format… Portrait looks
more like a
printed page…
Landscape looks
more like
television and
the movies
Using OHPs and OHTs
Portrait or
Landscape?
PORTRAIT tends to be easier to
fit everything on an
Overhead
Projector
LANDSCAPE seems
to work best using
Powerpoint and digital
projection
But this is not an “Unmovable Law!”
Using OHPs and OHTs
6W
1 foot of screen Width =
6 feet of viewing distance
i.e :measure the width of your
projected image in inches…divide by
two…and then move that many feet
away from the screen…people
should still be able to clearly see the
image.
Using OHPs and OHTs
How Big?…
here is an easy test.
Use the...
6W
formula!
Using OHPs and OHTs
Leave at least a 1
inch border around
your images.
Using OHPs and OHTs
Selecting Fonts…
some fonts are “Serif” such as:
• Times Roman
•Book Antiqua
•Copperplate Gothic
...these are better suited for
Titles or for the printed page.
Using OHPs and OHTs
Selecting Fonts…
some fonts are “Sans-Serif”
such as:
• Ariel
•Century Gothic
• Comic Sans
… these are better suited for
Text on projected visuals.
Using OHPs and OHTs
Selecting Fonts…
This is Arial size
60.
Can you read Arial 48?
How far back can you read Arial 36?
How far away is Arial 28 readable?
And how far can you go back and still read Arial 18?
Using OHPs and OHTs
Selecting Fonts…
whatever you choose…be
consistent - use one font for
the Title and one for the
text…people will get used to
the pattern
Title
text
Using OHPs and OHTs
Line Spacing
If lines of type are too close together,
they become very difficult for the eye to
separate. Although a leading default is
set on a word processor, the line
spacing can almost always be manually
changed.
If lines of type are too close together,
they become very difficult for the eye
to separate. Although the spacing
default is set on a word processor, the
line spacing can almost always be
manually changed.
Using OHPs and OHTs
Adding Colour…
colour can add effect to your
image…it can:
• highlight a particular feature
1st Qtr
2nd Qtr
3rd Qtr
4th Qtr
•or add drama or effect
Using OHPs and OHTs
Adding Colour…
colour can be added simply by
colouring in with a coloured pen
Using OHPs and OHTs
Adding Colour…
colour can be added by creating
your slide on a computer
program (Word or Powerpoint)
and printing on a colour printer.
WOW!
I am using
Colour!
Using OHPs and OHTs
Adding Colour…
WARM Colours
Using OHPs and OHTs
Adding Colour…
COOL Colours
Using OHPs and OHTs
Adding Colour…
Useful CONTRAST
ONE
TWO
THREE
FOUR
Using OHPs and OHTs
Adding Colour…
Bad Contrast
ONE
TWO
THREE FOUR
Using OHPs and OHTs
Beware of using too
much colour or the
wrong colours…
WOW!
I am using
Colour!
Using OHPs and OHTs
Beware of using
dark or complicated
backgrounds
WOW!
WOW!
I am using
I am using
Colour!
Colour!
Using OHPs and OHTs
Check that your
OHT can be seen
clearly
WOW!
I am using
Colour!
Using OHPs and OHTs
Use OHTs to….
Progressively reveal
information -using a sheet of
paper
Using OHPs and OHTs
Use OHTs to….
Create
overlays
to build up
layers of
information
Using OHPs and OHTs
Use OHTs to….
Complete questions
or tasks in front of
the group
Using OHPs and OHTs
Use OHTs to….
Let participants report
back and present
information to the whole
group
Using OHPs and OHTs
Using OHPs and OHTs
Using OHPs and OHTs