Re: Human color vision
Re: Human color vision
- Subject: Re: Human color vision
- From: Andrew Rodney via colorsync-users <email@hidden>
- Date: Tue, 14 Jan 2020 10:03:13 -0700
> On Jan 14, 2020, at 8:42 AM, Bob-BTY via colorsync-users
> <email@hidden> wrote:
> I wonder how old the 'Standard Observer' was?
Multiple ages! There is no single person used to produce the model we know of
as the Standard Observer:
Establishing Standard Observers
In 1927, physicists John Guild and David Wright gathered subjects and performed
a color matching experiment to determine how the average person perceives
color. Subjects were asked to look through a hole and match each color in the
spectrum by combining various intensities of red, green, and blue lights. The
hole only allowed a 2 degree field of view (similar to looking at one's
thumbnail from arm's length distance or equivalent to a 1.7cm circle from a
50cm distance) because of the belief that our color-sensing cones were located
in a 2 degree arc in the fovea, a region of the retina.
Note as well, the In 1964, the CIE defined an additional standard observer,
this time based upon a 10 field of view; this is referred to as the 10
Supplementary Standard Observer.
According to this site (verification necessary)
https://medium.com/hipster-color-science/a-beginners-guide-to-colorimetry-401f1830b65a
<https://medium.com/hipster-color-science/a-beginners-guide-to-colorimetry-401f1830b65a>
“In the 1920s two color scientists, W. D. Wright and J. Guild, each performed
similar color vision experiments. Wright performed his experiment on 10
subjects, Guild used 7. Their results agreed with each other so well that they
were combined by CIE to create the RGB color matching functions we’ve been
discussing.”
So if we inspect the actual history, we see that the Standard Observer is an
‘average’ of many samples just like D50 is a sample of many actual cases of
data collection.
Andrew Rodney
http://www.digitaldog.net/ <http://www.digitaldog.net/>
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