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Using Overhead Projectors
(OHPs) and Overhead
Transparencies (OHTs)
Using OHPs and 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 laser-printer 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.
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
6 W
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...
formula!
6 W
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
Using OHPs and OHTs
Title
text
Line SpacingIf 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.
Using OHPs and OHTs
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.
Adding Colour…colour can add effect to your image…it can:
• highlight a particular feature
•or add drama or effect
Using OHPs and OHTs
1st Qtr2nd Qtr3rd Qtr4th Qtr
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.
Using OHPs and OHTs
WOW!
I am using
Colour!
Adding Colour…
WARM Colours
Using OHPs and OHTs
Adding Colour…
COOL Colours
Using OHPs and OHTs
ONE TWO
THREE FOUR
Using OHPs and OHTs
Adding Colour…
Useful CONTRAST
ONE TWO
THREE FOUR
Using OHPs and OHTs
Adding Colour…
Bad Contrast
Beware of using too much colour
or the wrong colours…
Using OHPs and OHTs
WOW!
I am using
Colour!
Beware of using dark or
complicated backgrounds
Using OHPs and OHTs
WOW!
I am using
Colour!
WOW!
I am using
Colour!
Check that your OHT can be seen
clearly
Using OHPs and OHTs
WOW!
I am using
Colour!
Use OHTs to….
Progressively reveal information -using a sheet of paper
Using OHPs and OHTs
Use OHTs to….
Using OHPs and OHTs
Create overlays to build up layers of information
Use OHTs to….
Using OHPs and OHTs
Complete questions or tasks in front of the group
Use OHTs to….
Using OHPs and OHTs
Let participants report back and present information to the whole group
Using OHPs and OHTs
Using OHPs and OHTs
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