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Re: day for night

At 12:59 PM 1/12/98, Andrew Bowley wrote:

>It's possible that the 'night is blue' convention arose from another source
>-- our own perception.  In low light levels, we rely more heavily on
>receptors (can't remember if it's rods or cones) that are more blue
>sensitive.  Hence, kelvin readings aside, our 'night' vision tends to be
>'blue' vision.

Nope, not true. our low-level vision (rods) do not give any perceived
color, because they are luminance only. Nor am I sure they are particularly
blue-sensitive. Even if they were, the perception would still be

Mike Orton

| "I do not distinguish by the eye, but by the mind,      |
|   which is the proper judge of the man."                |
|         Seneca. 8 B.C.- 65 A.D.                         |

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