24ways: articles: 1 row where where "published" is on date 2012-12-04

1 row where "published" is on date 2012-12-04

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Link	rowid ▼	title	contents	year	author	author_slug	published	url	topic
77	77	Colour Accessibility	Here’s a quote from Josef Albers: In visual perception a colour is almost never seen as it really is[…] This fact makes colour the most relative medium in art.Josef Albers, Interaction of Color, 1963 Albers was a German abstract painter and teacher, and published a very famous course on colour theory in 1963. Colour is very relative — not just in the way that it appears differently across different devices due to screen quality and colour management, but it can also be seen differently by different people — something we really need to be more mindful of when designing. What is colour blindness? Colour blindness very rarely means that you can’t see any colour at all, or that people see things in greyscale. It’s actually a decreased ability to see colour, or a decreased ability to tell colours apart from one another. How does it happen? Inside the typical human retina, there are two types of receptor cells — rods and cones. Rods are the cells that allow us to see dark and light, and shape and movement. Cones are the cells that allow us to perceive colour. There are three types of cones, each responsible for absorbing blue, red, and green wavelengths in the spectrum. Problems with colour vision occur when one or more of these types of cones are defective or absent entirely, and these problems can either be inherited through genetics, or acquired through trauma, exposure to ultraviolet light, degeneration with age, an effect of diabetes, or other factors. Colour blindness is a sex-linked trait and it’s much more common in men than in women. The most common type of colour blindness is called deuteranomaly which occurs in 7% of males, but only 0.5% of females. That’s a pretty significant portion of the population if you really stop and think about it — we can’t ignore this demographic. What does it look like? People with the most common types of colour blindness, like protanopia and deuteranopia, have difficulty discriminating between red and green hues. There are also forms of colour blindness like tritanop…	2012	Geri Coady	gericoady	2012-12-04T00:00:00+00:00	https://24ways.org/2012/colour-accessibility/	design

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