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the thickness of the white cog on the black background is more than the black cog on white background

My logo is colored, and the client asked me to make a white version of it. But unfortunately the logo’s thickness increases in this white version. How can I overcome this?

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  • Simply changing the color should doesn't affect the shape. Perhaps there is a stroke doing something strange? Can you give more details about how you changed the color exactly? – BenoitLussier Feb 8 '18 at 0:17
  • I simply changed the color of the logo to white, but it seems to increase in size. No there is no stroke because the cog shape is expanded already . – New_spirit_designs Feb 8 '18 at 0:22
  • I have checked your images, and the lines are exactly the same width in pixels (12 px). So, it would seem to be an optical illusion. – Billy Kerr Feb 8 '18 at 9:15
  • yes, It seems like that. Thanks @Billy because I put them on top of each other and they were exactly the same size. – New_spirit_designs Feb 8 '18 at 17:57
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It's an optical illusion. If all you have done is invert the colours, than that is all it is.

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It is a known optical effect that light lines on a dark background appear thicker than vice versa. Here is a documentation of this effect for a font that comes in two variants to compensate for it.

You can account for it by making the light-on-dark strokes have approximately 0.92 the width of the dark-on-light strokes. (The value is empirical and seems to match the proportions in said font.)

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