When is the image changing out side the mask?

Software darktable
,
1

I hope the image, a screenshot, will have enough detail to support my question.

OS: Windows 10 Home, 22H2
DT: 4.6.1

Module: local contrast
mode(s): bilateral grid vs local laplacian filter

  • detail: 400%
  • coarseness: 50
  • contrast: 20

blend mask

  • mode: normal
  • opacity: 100%

parametric mask

  • L: 0 / 41.0 / 94.0 / 98.0
  • a, b, C, h: default values
  • boost factor: 0.000 EV
  • combine masks: exclusive

mask refinement

  • details threshold: 0%
  • feathering guide(s)**: in/output before/after blur
  • feathering radius: 250.0 px
  • blurring radius: 100.0 px
  • mask opacity: 0%
  • mask contrast: 0%

As you can clearly see, the area above the mask contains very few stars.

image
image2382Ă—1505 952 KB

However, in this image the area above them mask contains many more star. Even more so with the mode set to local laplacian filter.

image
image2384Ă—1501 994 KB

When using a mask, shouldn’t the settings configured only affect the area within the mask?

Thanks and God bless,
Genesius :pray: :camera_flash:

PS Let me know if you need a larger image of any of these modes/feathering guides.

2

I can’t really see what you are talking about here but are you showing an image with a drawn and parametric mask and if so where exactly are the differences??

If you do a check by just blending in difference mode it should clearly indicate what part of the image is impacted by your module under different settings or conditions…

If you are going to use such large radius for blur and feathering … you can see clearly your adjustment moves beyond the boundaries to facilitate that…

This is with no blur or feather

image
image755Ă—592 74.2 KB

vs this with your feathering and blur…

image
image975Ă—797 167 KB

2 Likes
3

In case you are unsure how to visualize your mask as a yellow overlay here is a screen shot of the icon (highlighted) that you click on to visualise the mask.

image

1 Like