On 2011-09-11 08:00, Warp wrote:
>    Now, how do we *draw* this surface? The problem is that the relationship
> between irradiance and the brightness perceived by the human eye is far from
> linear. In other words, the surface might be emitting 50% of the incoming
> light, but it will not *look* half as bright as a fully-lit white surface.
> In fact, rather than looking 50% gray, it will look approximately 73% gray,
> because that's how the human eye perceives it.

Query:  is this a matter of how the human eye sends data on to the 
brain, how the brain processes the raw eye-data, or a combination of the 
two?  Are the values the same for everyone?  If they're not, what's the 
range that different people see?

Obviously, there's probably the average perception that's being 
targeted, but...it does make me wonder.

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