![]() All that is needed is a tape measure and a scientific calculator, or a mobile device running a scientific calculator app. 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. 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. 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. Under Emulation > Media check CSS media and select print (3).Legibility is very important for any videowall application with sources that include alphanumeric text.Make sure the drawer is shown by clicking the Show drawer button (2) or pressing the ESC key to toggle the drawer.Open the Emulation (4) > Media (5) tabs, check CSS media and select print (3).Make sure the console is shown by clicking the menu button (2) > Show console (3) or pressing the ESC key to toggle the console (only works when Developer Toolbar has the focus).Click the Toggle device mode button in the left top corner (1). ![]() Check Emulate print media at the rendering tab which can be opened by selecting Rendering in menu at (2).Make sure the console is shown by clicking Show console in menu at (1) ( ESC key toggles the console if Developer Toolbar has focus).Click the Toggle device mode button in the left top corner ( CTRL SHIFT M).Open the Developer Tools ( CTRL SHIFT I or F12).Check the Emulate print media checkbox at the Rendering tab and select the Print media type.Click the Customize and control DevTools hamburger menu button and choose More tools > Rendering settings (or Rendering in newer versions).Open the Developer Tools (Windows: F12 or Ctrl+ Shift+ I, Mac: Cmd+ Opt+ I).Note: This answer covers several versions of Chrome, scroll to see v52, v48, v46, v43 and v42 each with their updated changes.
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