Re: Chromatic adaptation -- original Von Kries ideas
Re: Chromatic adaptation -- original Von Kries ideas
- Subject: Re: Chromatic adaptation -- original Von Kries ideas
- From: Graeme Gill <email@hidden>
- Date: Wed, 01 Jul 2009 10:00:24 +1000
Roger wrote:
But suppose I now step indoor with my red apple, and I'm seeing it under
tungsten light. My question is : could it be argued that the "red" color
will appear red as though my brain has somehow adjust the gain sensitivities
of my cones to render the red to some abstract, possibly innate, notion of
"white", that would be independent of the scene? Maybe I'm trying to read
too much in chromatic adaptation?
Hi Roger,
I don't imagine that this is a realistic mechanism, since cone
gain sensitivity adjustment seems to be low level and automatic.
More likely that there are several stages of adaptation, with latter
ones occurring further along the vision processing/interpretation pipeline.
Some may be partially learned, and therefore influenced by what we
recognise.
I'm certainly conscious of some situations (tinted paper) where
the cone adjustment is incomplete (meaning that the paper looks
tinted), yet photographs reproduced on the paper appear to
have white highlights. So the cone adaptation is partial, and it
must be the higher lever image interpretation processing that
is doing the rest of the adaptation.
Graeme Gill.
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