[Tig] Tetrachromancy

Rob Lingelbach rob at colorist.org
Mon Sep 10 08:09:51 BST 2012

I wish I could examine this in more detail but it has already been done on the TIG in years past.

Women have an extra X chromosome.  This makes for some very interesting color variations between
men and women.  I could refer you to:


but I'm not sure that this is definitive.  (be careful what you believe on the published internet).

I have always noticed that women, when in the grading suite, are able to see nuances of color difference
that I, the colorist, am amazed they can discern.  

On Sep 9, 2012, at 11:48 PM, Richard Kirk wrote:
> On 10 Sep 2012, at 04:22, Steve Hullfish <steve4lists at veralith.com> wrote:
>> http://www.colourlovers.com/blog/2010/03/18/tetrachromacy-in-humans-you-may-have-super-color-vision
> Hmm. I think that people may be able to see a little in more than three primaries, but I doubt this is because they have an extra set of cone sensors. Our red sensors probably came from a genetic variation in the green sensor, so the mechanism is plausible. However, the known genetic variations are small (I had a plot somewhere at the end of the Truelight "Standard Colour Spaces note if you are interested). If someone had some extra types of cell, someone ought to have proved their existence and measured their response with a fundus microscope.

Rob Lingelbach  http://rob.colorist.org

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