[LCA2019 Chat] Careful with Slides with low contrast

[Simon Lyall]

If you are speaking be careful if you slides have low contrast. Eg Dlue on 
a black background. The projectors may have a lower contrast than a normal 
screen.

See attached image. The text and text box is easily viable on the screen 
to the right, but the projected image to the left is really hard to see 
(and this is after the lights were turned down).

Simon.
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