HSL: Affinity Photo vs Photoshop Question

[3ark 0]

Hi there,

I'm new to AP but have been using PS and LR for years. I've noticed that the HSL tool in Affinity Photo looks to be nearly identical (save for the omission of an "orange" channel). However if I use values in AP similar to the ones I would use in PS or LR the image ends up clipping or being posterized. Am I doing something wrong? 

I have attached an example. This is before using the HSL tool in AP.

After HSL in Affinity Photo, notice the posterization effect, this does not occur in PS or LR. Maybe the scales are different?

[3ark 0]

After a bit more experimenting I found that it only appears to be Luminosity adjustments that cause the strange artifacts. With some digging I found another user with the same issue (thread here: https://forum.affinity.serif.com/index.php?/topic/10455-luminosity-shift-issue-in-hsl-adjustment-affinity-photo/). I'm still not sure if this is a bug or if I'm simply being too heavy-handed.

[rudyryk 0]

I also did noticed these strange effects with Luminosity. I believe that's the same issue as described in the thread linked above.

[csp 47]

i also have seen this problem a few  month ago and reported this bug but it seems this is still not fixed