Viewgraphs, ContinuedDiazo reversalsUsing a negative image instead of a positive image can be advantageous whenyou want to focus viewer attention on the screen. Negative transparenciesare known as reversals. They have a clear image on a dark or coloredbackground. Reversals are easier on the eyes than positive images. Toprevent eyestrain, do not mix reversals with positive image viewgraphs.Start with a negative image master or make your own negative by using acommercially available reversing film in the diazo machine.Figure 2-24 shows an example reversal.Figure 2-24. —A reversal.Continued on next page2-42
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