The number of arc minutes text and characters that occupy a person's viewing field can easily be calculated. This is a good rule of thumb to follow when designing videowalls, especially in environments where critical information is displayed. Figure 2-13 demonstrates that doubling the text height from 1 to 2 inches (25 to 50 mm) improves legibility, since the text now occupies 19 arc minutes for the furthest viewer.įrom this illustration, it can be generalized that providing a text height of 1 inch (25 mm) for every 15 feet (4.5 m) of the maximum viewing distance will ensure legibility for the viewer. To improve legibility for the furthest viewer, text should be rendered at a larger size, or source window sizes should be expanded.
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The sidebar provides more details on calculating arc minutes based on the text size and viewing distance. While this is acceptable, text read by a viewer 30 feet from the videowall only occupies 10 arc minutes, which is not acceptable for extended viewing. The text is 1 inch (25 mm) high, which occupies 19 arc minutes of the nearest viewer’s vision. The example in Figure 2-13 illustrates an environment where the nearest viewer is 15 feet (4.5 m) from a videowall, and the furthest viewer is 30 feet (9 m) from the screens. A safer rule of thumb is for any displayed text to occupy at least 15 to 20 arc minutes of the furthest viewer’s vision.* Figure 2-13. However, this size may still appear to be too small for many viewers, and eyestrain is likely over long periods of time. Viewers should be able to easily read text at all intended viewing distances without eyestrain.Īt a minimum, text on a videowall should occupy 10 vertical arc minutes of the viewer’s vision to be legible. Additional display area may be required to provide adequate space for enlarged windows, which translates to larger displays, or extra rows or columns of screens.
Illustrator video pixel aspect ratio calculator windows#
When considering legibility, it is important to take into account the distance between the farthest viewer and the videowall, and use this “worst case” scenario to determine how large source windows should be, or what font size should be specified when creating content. Delivering adequately sized text can be accomplished by scaling up or enlarging the source to make fonts legible, or by rendering content with text at appropriate font sizes. Viewers should be able to easily read text at all intended viewing distances without eyestrain.
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Legibility is very important for any videowall application with sources that include alphanumeric text.