Instruments - effect scaling - improve intensity

[user0]

XnViewMP 1.7.2 64bit
Windows11 (23H2), display resolution 3840x2160, win scaling 150%

Instruments - effect scaling
effect of some tools is too strong way before it reaches 100%, eg
Saturation
at 50% effect is already excessive, in other apps it does not reach such extreme even at 100% (only in Photoshop at 90%)

test_img_wolf.zip

(101.67 KiB) Downloaded 41 times

Suggestion

• improve instrument 's effect intensity scaling
  for Saturation, Brightness, Contrast, Lightness, etc
  options, eg:
  • decrease max scale by ~x5-10 (ACDSee, FastStone, CaptureOne, DxO)
  • change scaling from linear to parabola (something like Photoshop?)
    as end (extreme) values are rarely required, most adjustments happens in the low-mid range, eg

    

    parabola.png (5.76 KiB) Viewed 2848 times

[xnview]

See issue for current status and some details.

[xnview]

This problem is supposed to be fixed in XnView MP 1.8.1. Please check and confirm the bug fix here.

[user0]

done in 181

[manuel_songokuh]

but i find BUG:

i download zip 1.8.1 (windows)
i open xnviewmp: adjust saturation: from 0 to -100 result high saturation.. WRONG

my linux 1.8.1
i open xnviewmp: adjust saturation: from 0 to -100 result correct nothing saturation.. CORRECT

[user0]

yeah, issue with negative values

[manuel_songokuh]

yeah, issue with negative values

this is for windows right? but my linux is correct not bug..

[xnview]

right

[xnview]

This problem is supposed to be fixed in XnView MP 1.8.2. Please check and confirm the bug fix here.

[user0]

182
issue with negative values fixed

[geoffm]

I was going to post a new thread about the uneven sensitivity of contrast, brightness and saturation since a few versions back but I think it's related to this.
It used to be that tiny incrementals made big changes, especially in saturation, but now virtually nothing happens between -30 and +30.
Seems like the gradient of changes could be better adjusted.