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I am designing the layout for a touchscreen for outside use, What are some good color combination to use that will be visible under the sun light for outside use? Maybe bright neon colors?

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Hi Kevin, welcome to UX.se! Your questions is too vague to answer right now. What is the purpose of the application? What is the content? Add some details and make the question be about UX rather than visual choice. –  rk. Apr 18 '13 at 21:38
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A colour scheme with high visual contrast will work better in conditions that are more difficult to see - such as in direct sunlight.

In addition to contrast, human vision isn't sensitive to all colours equally, with the peak being in the green colour spectrum. The graph below shows the sensitivity:

enter image description here

Taking onto account the sensitivity to light in human vision in combination with contrast, black on yellow produces the highest visual contrast. This is why number plates are often yellow with black writing.

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If you want to bother with accounting for visually impaired people, here are some guidelines you can follow:

http://www.lighthouse.org/accessibility/design/accessible-print-design/effective-color-contrast

Exaggerate lightness differences between foreground and background colors, and avoid using colors of similar lightness adjacent to one another, even if they differ in saturation or hue. enter image description here enter image description here

Choose dark colors with hues from the bottom half of this hue circle against light colors from the top half of the circle. Avoid contrasting light colors from the bottom half against dark colors from the top half. The orientation of this hue circle was chosen to illustrate this point. enter image description here enter image description here

Avoid contrasting hues from adjacent parts of the hue circle, especially if the colors do not contrast sharply in lightness.

enter image description here enter image description here

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