Re: [TAN] Is saturated blue inherently dark?
Re: [TAN] Is saturated blue inherently dark?
- Subject: Re: [TAN] Is saturated blue inherently dark?
- From: Graeme Gill <email@hidden>
- Date: Sat, 06 May 2006 10:13:21 +1000
Giordano Galli wrote:
Would it be possible to say that saturated blue colours
are inherently dark compared with other hues because of
the second layer of the retina taking its input only
from green and red cones when evaluating brightness?
If this is the case, does the difference in brightness we
(or is it just me?) instinctively associate with various
hues follow from the above-mentioned second layer filtering?
I can't confirm your theory as to the mechanism, but blue
colors produced from uniform energy spectra (such as printing
systems), will be darker than other possible colors because
our luminous efficiency curve is lower in the blue wavelengths.
This need not be true for additive display devices though,
since it's possible for the blue stimulant to use more energy.
As far as I'm aware, there is only one layer of receptor cells
in the retina - all four types of receptors lie next to each other,
though in different concentration in different areas.
The mechanisms that determine our overall luminous efficiency curve
seem to be many, from the inherent sensitivity of each of the three
color receptors, the pigment in the lens (particularly as we grow older),
the protective macular pigment over the central part of the retina
(compensated for by the super-senstivity of the blue receptors in
this area), the color of the blood overlaying the retina,
and the choroid coat below the retina, all seem to filter more
blue than any other wavelength.
Graeme Gill.
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