https://bugs.freedesktop.org/show_bug.cgi?id=80196
--- Comment #10 from Wade D. Peterson <[email protected]> --- 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 -- You are receiving this mail because: You are the assignee for the bug.
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