[PD] Spectrum graphing amplitude problem

[Mathieu Bouchard]

On Tue, 23 Oct 2007, Andy Farnell wrote:

> There are some other interesting effects if watching a spinning wheel 
> made of black and white spokes, some people see colour flashes at 
> certain speeds where the cones are tricked into firing instead of the 
> rods. But I've never seen the wheel spin backwards in natural light.

rods are not used in bright light. They are using the yellow, green and 
violet cones together. the concept of brightness is a combination between 
the three, and the chroma is found by subtraction, resulting in 
something fairly equivalent to YUV.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada