I agree that gamma correction helps, but we're not talking about gamma, we're talking about color. Here's a version of the page I shared earlier with ITU REC BT.701 gamma correction applied: https://justine.lol/color-gamma.html It still has the same color problems. In fact they should be easier to see now that the white/dark issue is fixed.

Could you explain how linear interpolation is different from sRGB interpolation? I would have thought they were the same thing. If by sRGB you mean interpolating but being lazy about gamma, I'll be the first to admit that's just plain old incorrect, even though laziness is sometimes a virtue.

Also are you one of the demo authors? If so we could probably move this conversation to Discord or email and we could try some more blending methods!