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I'm going to create GUI for a mobile app that will work in bright sunlight environment (inside a car so it will not be fully exposed to sunlight) and the usability and visibility of certain GUI elements are the most important factors.

What are some tips for creating such UI? What colors should I use?

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A car's cockpit is a good orientation aid for this. Aim for high contrast. Black background and possibly white graphics/text. Black absorbs sunlight so it isn't reflected back to the user. Colored elements need to be a little bit larger than normal.

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um, I think you got the black wrong. Black shiny surfaces make better mirrors... – KMSTR Apr 28 '13 at 15:12
@KMSTR: A black shiny surface is really a black surface (LCD panel, in this case) under a shiny surface (glass cover). Any specular reflections off the glass aren't much affected by the color of the LCD panel under it, except that they're easier to see against a dark background than against a light one. The real lesson here is that glossy screens suck in brightly lit environments. – Ilmari Karonen Apr 28 '13 at 16:39
Yes. I should have said the color choice was wrong and not just the choice of black. – KMSTR Apr 29 '13 at 16:42

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