What would be the best image/icon to represent transparency?
It should be as compact as possible and fit in a 13x11 area.

I see that I should add more information.
I need this image/icon to be placed on a system button on the Windows OS:
AeroBasicXPClassic... So I'd rather have something more scalable.
One thing to note... This should be system interface, not my program's so it must be as least symbolic as possible and most straight-forward to the idea/function.

After igor's idea, here are my results:

closed as off topic by Benny Skogberg, JonW May 19 '12 at 7:42

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Why not this alt text?

  • I thought about that one too (from Paint.NET), but I'd like something that represents "variable transparency". – Vercas Dec 21 '10 at 12:27
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    @Vercas try transparent linear gradient to any icon would you like to show variability. – igor Dec 21 '10 at 12:35
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    @Vercas welcome – igor Dec 21 '10 at 14:01
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    And now I've finished my icons. I'm adding them to the question! – Vercas Dec 21 '10 at 14:10
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    @Vercas awesome! – igor Dec 21 '10 at 14:19

maybe an empty glass alt text

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    This was totally unexpected... I think it might work but it just doesn't theme with the OS... Windows in this case. – Vercas Dec 21 '10 at 12:11
  • CorelDraw and CorelPhotoPaint use this, and for a variable transparency, a glass, plus a line-with-arrowhead. Worked great for them. – Warren P Mar 5 '12 at 17:45

I would use a gradient if it's for variable transparency.

A square from black to clear.

  • "square from black to clear" - could you explain that to me? – Vercas Dec 23 '10 at 10:45
  • A small square that is black, but has an alpha gradient from left to right. So, the alpha would be 1 on the left and 0 on the right. – DexterW Dec 23 '10 at 19:13

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