Digital BW, The Print

> One further point on this is that we use our B&W vision - from the rods -
> for determining detail, edges, movement, etc., and our color vision - from
> the cones - merely adds color to the details provided by the B&W vision. I
> suppose it is rather like Lab - the luminosity channel provides
> the detail,
> and the a,b channels the color overlay.

Bingo, Bob.  Thanks for clarifying that point...it's what I meant by "both
are active at any one time"...  We really only "use" about 1/4th (spatially)
the color information than we do grayscale information.

> Color vision is believed to be a recent evolutionary add-on to the basic
> animal B&W vision. Most animals don't possess the color add-on,
> and do only
> see in B&W.

Was it a plug-in? ;-)

Regards,

Austin