The key to good typography on TV is to test constantly. Thin, small type on your monitor will look clean and crisp, but once on a TV it may appear blown out or become unintelligible. We define our font sizes early in our process by building a test mock and testing type on a TV screen.
Designing for Television, Part 1
Molly Lafferty
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Really important. Sometimes it is also important to define different distances, like 2m - 3m — 5m and to check if typography still works.