Hardware Reference
In-Depth Information
Figure 4-6:
he inished
autocue.
Now it's time to place the box open side down over the monitor and run the program. he
results are shown in Figure 4-7.
You can use normal picture frame glass, and it will give no problems with the size of letters
shown here in Figure 4-7. However, there is a small bit of fuzziness or ghosting due to some
relections from the other side of the glass. You can see this in a closeup of the autocue, as
shown in Figure 4-8; this was taken with a longer exposure than the photograph in Figure
4-7. You can minimise this double relection by using as thin a piece of glass as you can get.
Another way to cut it down, and to increase the brightness of the prompt in the bargain, is to
use some half silvered glass, which is sometimes called a
two-way mirror.
he cheapest way to
get this is to apply some laminate ilm to the glass - the type used for tinting windows. It
cuts down the light reaching the camera, but you can compensate for that by using stronger
lighting on the subject or a longer exposure/larger aperture on the camera. Make sure that
you get the neutral tinted type; otherwise you will get a colour cast over what you ilm. You
can get glass like this in various degrees of partial relectivity. It would have been better if the
inside of the box was sprayed black, but it works acceptably without this.
