What a nicely-designed resource for information about color theory along with some material about its use in UX and data visualization!
Notes about color theory
Color nerdery ahead: I’ve been a fan of the CIELAB color space ever since I discovered Lab mode in Photoshop 20-ish years ago — it’s so awesome and useful to be able to manipulate color channels separate from luminosity! — and so I’m thrilled that web design is heading that direction as well with the new OKLCH color space in CSS Color 4.
This article from Evil Martians about why they’ve made the switch to OKLCH is a great read on the ins and outs of the new color space and why you should consider using it over the more familiar ancient standards. The TL;DR: unlike hexadecimal or RGBa values, Lab/LCH is much easier to read and adjust directly in CSS as well: want to make a color more saturated? Just adjust the middle value, chroma! Oh, and contrast is preserved between different colors so long as the Luminosity remains the same, which makes conforming to the WCAG-compliant color contrast accessibility guidelines that much easier.
I also learned from this in-depth article that Adobe Photoshop has adopted the OKLab space as a “perceptual” option when generating color gradients. Look at how ugly that “classic” gradient is in their screenshot! Gradients in Photoshop have always been messed up, so this is a pretty huge change that they’ve made.
From Andrew Somers, a great primer on how color vision works and how illuminated display technology maps perception to luminance contrast, color gamut, etc. Especially useful is his writeup of not only WCAG 2’s limitations for determining proper contrast for meeting accessibility needs but also the upcoming standards like APAC (Accessible Perceptual Contrast Algorithm) that will pave the way for more useful and relevant a11y standards.
A nice write-up on color grading in films, especially after the 1990s advent of digital intermediates and LUTs — or to say it more clearly, Why do movies all look like that these days??
From Moby Dick, chapter 42, “The Whiteness of the Whale”:
Is it that by its indefiniteness it shadows forth the heartless voids and immensities of the universe, and thus stabs us from behind with the thought of annihilation, when beholding the white depths of the milky way? Or is it, that as in essence whiteness is not so much a color as the visible absence of color, and at the same time the concrete of all colors; is it for these reasons that there is such a dumb blankness, full of meaning, in a wide landscape of snows – a colorless, all-color of atheism from which we shrink? And when we consider that other theory of the natural philosophers, that all other earthly hues – every stately or lovely emblazoning – the sweet tinges of sunset skies and woods; yea, and the gilded velvets of butterflies, and the butterfly cheeks of young girls; all these are but subtile deceits, not actually inherent in substances, but only laid on from without; so that all deified Nature absolutely paints like the harlot, whose allurements cover nothing but the charnel-house within; and when we proceed further, and consider that the mystical cosmetic which produces every one of her hues, the great principle of light, for ever remains white or colorless in itself, and if operating without medium upon matter, would touch all objects, even tulips and roses, with its own blank tinge – pondering all this, the palsied universe lies before us a leper; and like wilful travellers in Lapland, who refuse to wear colored and coloring glasses upon their eyes, so the wretched infidel gazes himself blind at the monumental white shroud that wraps all the prospect around him. And of all these things the Albino Whale was the symbol. Wonder ye then at the fiery hunt?