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by refulgentis 700 days ago
I'm not sure why saturation couldn't be controlled.

I probably missed something in the article, though I do see ex. desaturated yellow in the photographs so I'm not sure this is accurate.

If you can't control saturation, I'm not sure dithering won't help, I don't see how you'd approximate a less saturated color from a more saturated color.

HSL is extremely misleading, it's a crude approximation for 1970s computing constraints. An analogy I've used previously is think of there being a "pure" pigment, where saturation is at peak, mixing in dark/light (changing the lightness) changes the purity of the pigment, causing it to lose saturation.

2 comments

Any desaturated colors I saw were also very bright, so I blame it on overexposure of the camera. Probably looked totally different in person.

Unsaturated colors aren't a problem, you just need to mix a bit of the opposite color. Unsaturated purples will be a challenge because you need to mix 3 wavelengths rather than just 2.

Saturation can't be controlled on a per-pixel basis because, per the article, they're tuned to a specific wavelength at any given time.

You're right though, there appear to be yellows on display. Maybe they're doing temporal dithering.

Edit: Oh wait, yellow doesn't need dithering in any case. Yellow can be represented as a single wavelength. Magenta on the other hand, would (and there does seem to be a lack of magenta on display)

> Saturation can't be controlled on a per-pixel basis because, per the article, they're tuned to a specific wavelength at any given time.

Where does the article say this? I couldn't find it.

Honestly might just be the limits of photography, there's so much contrast between the ~97 L* brightness of pure yellow and black that the sensor might not be able to capture the "actual" range.

I've been called a color scientist in marketing, but sadly never grokked the wavelength view of color. It sounds off to me, that's a *huge* limitation to not mention. But then again, if they had something a year ago, its unlikely ex. Apple folds its microLED division they've been investing in for a decade. Either A) it sucks or B) it doesn't scale in manufacturing or C) no ones noticed yet. (A) seems likely given their central claim is (B) is, at the least, much improved.