Lightness changes at high lightness do not appear to be uniform

[Pinpickle]

Look at the below image:

This was generated by:

• taking an original colour (#3be2a0 with the dot on it)
• adding 8 to the lightness channel of the original colour
• adding 16 to the lightness channel of the original colour

As we are adding the same amount to the lightness channel (8), the differences in lightness should appear to be the same. I know this is all subjective, but to me the jump from the second to third colour looks much larger from the first to second.

In darker colours, I don't observe this (jumps seem perceptually uniform to me).

As HSLuv is supposed to be perceptually uniform, I thought this wasn't supposed to happen, at least to this extreme extent.

So I'm wondering if there's anything that can be done about this? Or is this a limitation of the system? Or am I misinterpreting something?

[imkremen]

@Pinpickle The difference you are talking about is actually color difference.
Here some useful guide http://zschuessler.github.io/DeltaE/learn/

[Erudition]

Is this the same phenomenon as how the colorfulness moves around in the L-slider on the homepage as you adjust to different hues? Because in that case I think it's an artifact of using a percentage instead of the absolute lightness

[boronine]

@Pinpickle I just double checked your colors, looks like this is indeed a problem. I'm afraid it comes from CIELUV, since HSLuv takes the lightness parameter from it.

@Erudition no, this lightness issue is unrelated. What you are seeing is a different issue having to do with using saturation (percentage) instead of absolute chroma. This is a well-known limitation of HSLuv, I try to make it clear in the Comparison page.