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I made that by drawing a circle-shape in a 12x12 pixel file in photoshop, and snapping the shape to a 1x1 pixel grid. It should be perfectly symmetrical, both horizontal and vertical.
Why are pixels that should be the same value different?
weird...
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Missing Image ;(
Thanks for the comment enknot, it's true that photoshop makes the squares grey because the vector falls between two pixels. It probably uses some calculus to figure out the percentage of the pixel that lies inside the vector vs. outside and shades the pixel to that level of gray. But those pixels I'm pointing out should technically have the exact same section of the vector lying across them, just rotated/flipped. So it makes no sense why photoshop doesn't color shade those pixels exactly the same gray.
It think it's because squares are not circles, and can never really make them, but it's easy enough to trick the human eye if you use some averages and percentages.
The % of the square that was inside the circle probably directly correlates to the amount of gray it is.
This is just an (educated) guess, but if you calculated the amount of space that those squares overlap with that circle, you could find the ratio that the pshop people use to calculate anti-aliasing stuff...
just a guess though really.