One presenter points out that the background for a VDT should be close to the luminance Of 15-20 minute talks, each prepared by a different person, the light type-on dark slidesĪre *not* easier to read, and screen glare is a hypothetical, not actual problem. Third, in my own experience at scientific meetings, where one sees a weeklong succession White backgrounds ensure that there will be at least some light in the room. Many talks are given under conditions where the presenter will have no control over Most typefaces including screen fonts are designed for black-on-white. It's quite a spartan approach (no watermarks, no background).Įveryone here seems to prefer light type on a dark background.
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You have total continuity between screen and paper (we also have to produce the manuals to go alongside the presentations) which this also keeps printing costs down. Primarily, because it is visually uncluttered (title, graphic, text). We have followed the paper paradigm with black text on a white background for a number of reasons.
The environment is controlled (lighting and such like) and standardised. As these courses are entirely computer based, the students may spend all day in front of the projector. I am involved with the production of training courseware for military end users. Should we change the colour every day to keep them interested? Should we change it for the period just after lunch when they become lethargic? Should it change to reflect the content or how they learn? You should simply look at the various design solutions under real conditions to see what is going on, and not depend on verbal discussions such as this to decide!Īre there any different suggestions for longer term exposure to projected presentations? For example, every day for three weeks if you are on a training course.
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Check your presentation room out in advance, test your projectors, find out how to control the room lighting and the window curtains if necessary. But we should never be working at the edge of legibility in any situation, so legibility tests might not be relevant.įor projection presentations, obviously the figure/ground contrast must be sufficient to overcome the ambient light. It is also harder to read white type on a black ground (there surely must be some evidence about this). On paper, white type on a black background can result in filled-in serifs because of the printing process. Television control rooms and airplane cockpits generally have darkened backgrounds upon which to display lighted data. Of course on the computer screen, one can just turn down the brightness control when working at night or in a darkened room. For example, our screens on this website usually have a light tint on the ground to reduce the electric blue-white video glare. So you should try to reduce video glare, perhaps by reducing the figure/ground contrast. Sometimes the old fashioned computer screen seems less tiring, showing lit-up text on a dead backround. This sometimes results in video glare, with lots of rays coming from the background. The usual metaphor for screens (projection and computer) these days seems to be black type on a white background, that is, a paper metaphor.
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