[Libreoffice-ux-advise] [Bug 80196] standardize color palette using mathematically generated colors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80196

--- Comment #10 from Wade D. Peterson <wadep_silicore at yahoo.com> ---
Talking points about a color palette organized according to gray scale (a.k.a.
gray tone, or luminance contrast):

1) In the human visual system, color recognition is secondary to gray scale
recognition.  The following quotes from Marmor and Ravin (2009) describe the
role of color during visual processing in the brain:

“Thus, the color information has already been segregated from the more basic
(evolutionarily older) mechanisms of perception, which are effectively
color-blind.  The bottom line is that we need luminance (brightness)
differences to optimally recognize shapes, faces, depth, and movement.”  (p.
55)

“To summarize, color alone will not function effectively to represent objects
(or depth), unless it also provides realistic luminance contrast.  Most
representational artists recognize light and dark aspects of the paintings
accordingly, such as in Raphael's Renaissance painting 'A Lady with Unicorn'.”
(p. 57)


2) The most common form of color blindness is a red-green color deficiency, and
is typically found in men.  These people tend to see colors as shades of blue
and yellow.  According to Marmor and Ravin (2009):

“Red-green color deficiency affects 8 to 10 percent of males, so it is not
uncommon.”  (p. 88)


3) People with a color deficiency tend to rely on gray scale color recognition.
 According to Marmor and Ravin (2009):

“Because colors are less subjectively intense, the color-deficient person – and
artist – tends to be more sensitive to subtle lights and darks which may be
obscured by colors that distract our attention (as in camouflage).”  (p. 89)

“When asked about colors in the countryside, he [Jens, an artist with a
red-green color deficiency] responded: 'Well mostly these are known, and my
mind tells me one thing and my eyes another.  Essentially I am seeing a lot of
contrast.  I like things with contrast in them.'” (p. 90)


4) Ansel Adams, a well-known American landscape photographer who worked
exclusively with black-and-white images, relied on the 'Zone System' for his
photographs. This system divided an image into eleven (11) gray tone levels
between black and white.


5) Many people print color images on black-and-white printers.


6) Many technical artists design their images so that they can still be useful
(recognizable) when printed on black-and-white printers.


7) A color palette organized according to a gray tone scale is the easiest way
to mentally convert a color image to a monochrome image.  This allows the
graphic artist to more easily design color works that will still look good when
printed on a black-and-white printer.


Cite:
Marmor, Michael F. and James G. Ravin.  The Artists Eyes : Vision and the
History of Art.  Abrams, 2009.  ISBN: 978-0-8109-4849-5

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