Latest post of the previous page:
See the response from "Carl":Alan H wrote:The 'green' and the 'blue' are, in fact, the same colour!
For further details, see Richard Wiseman's blog.
Not that I didn't believe him, but I've checked it as well!
This version has no anti-aliasing, and although it still works as an optical illusion, it's easier to see that the 'blue' and the 'green' are actually the same colour:That’s pretty impressive, although there is a bit of a digital-image artefact which could be affecting the result. If you zoom in a lot so you can see the individual pixels, you’ll notice that the jaggy borders between colour regions have significant ‘anti-aliasing’, resulting in several pixels of an in-between colour along the borders. This is a standard digital image technique, making jaggy, pixelated lines look smoother. However, in this case, it could be accused of contributing to the perceived illusion effect.
You’ll note that at the centre of the image, the spirals get so close together that the anti-aliased blends become larger than the spirals themselves, and so most of the pixels of the ‘green’ are very much NOT the same colour as the pixels of the ‘blue’.
However, I will concede that the bands at the outside are wide enough so that there is significant amounts of same-coloured pixels. So, yeah, after all that, it seems the illusion still ‘works’, and it’s damned good.
Still, for complete rigour, I wonder if anyone can be bothered rendering a high-resolution version with no anti-aliasing.