Re: [Phys-l] perception of variations in hue

[Stefan Jeglinski <jeglin@4pi.com>]

> If you want to see something that is (a) pretty and (b) weird,
> check out http://www.av8n.com/imaging/disk-rays-no-rays.htm


Hmmm. I see rays in both - if by rays you mean a noticeable change in 
what I would call "contrast," when comparing one side of a radial 
vector to the other side of the same vector. That is, some areas in 
the two disks appear to have a smooth change in color, where as 
others seem to have subtle step changes in color. These step changes, 
as I call them, although small, are distinct enough to give the sense 
that there are radial "rays" in each disk.

I note that the rays are not the same in the figures. That is, the 
disks do not appear identical to me. Possibly that saves me from 
being a complete failure at this :-)

I'm not sure if this is my eyes, or my [LED] monitor. I *do* see the 
bright spot in both. I'm not sure I'm seeing what I'm supposed to see 
though. For example, I would not describe the rays in either as 
"bright" - merely noticeable.

Do essentially all people see the difference you describe - or just most?


Stefan Jeglinski