2

Working on a filter for desktop, and need to decide which kind of filter handle giveS the user the obvious impression that they can use it as a slider.

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Any other suggestions besides the above are welcome as well.

3

Combine 1+2 with a little bit of seasoning.

Option 2 is great because the selected range is thicker and a bit darker. But the black handles don't provide any affordance. So I would replace them with circular handles from Option 1, but why not throw in a bit of drop shadow for that extra-affordance?

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0

Without knowing much of the context or output, I'd say four initial things:

  • remember the affordance in context (is it to be manipulated by mouse or finger, or both, and which of these better indicate that/both of those interactions?)
  • similarly, remember the affordance must be 'visible' in the context of use (straight up, regardless of device, 4 and 1 throw up 'visibility' flags because of colour and sizing.)
  • what are people used to? (for the output, in similar interactions, in similar contexts, etc)
  • What can there be as a failsafe? Text input? (Sliders and Accessibility: Usability of sliders for users with disabilities)

And then test!

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