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Fringe killer usage

Posted: Sat Apr 03, 2021 10:39 pm
by mgutierrez
Hi all,

I'm trying to remove chromatic aberration from some stars. Fringe killer works nice but leaves a grayish background color where I apply the filter:

before:
Selection_077.png
Selection_077.png (47.57 KiB) Viewed 3507 times
after:
Selection_079.png
Selection_079.png (47.22 KiB) Viewed 3507 times
any tips?

m

Re: Fringe killer usage

Posted: Sun Apr 04, 2021 6:35 am
by admin
The Finge Killer indeed leaves the luminance (detail) intact and only attacks the color.

A few different techniques;
  • You could try the Shrink module on those stars, with Color Taming increased.
  • If your blue channel is very poor, you could also decide not to use it for luminance at all; use the Compose module to create a synthetic luminance frame from just red and green (set blue exposure to 0).
  • You can also use the FilmDev module to throttle the blue channel's luminance contribution before using the Filter module.
Hope this helps!

Re: Fringe killer usage

Posted: Sun Apr 04, 2021 8:28 pm
by happy-kat
Another option is to select all the problematic stars and exclude them from the colour module so they stay as just luminance.

Re: Fringe killer usage

Posted: Fri Sep 03, 2021 10:48 pm
by mgutierrez
OMG, I don't know how could I miss my own post!!! shame on me!!! very sorry guys!!! thanks for your replies!
I've tried your workaround, but does not seem to work for me. Or maybe I don't know how to implement them. Using a mask is quite tricky for me. There are many stars that suffer from this aberration, but not all of them. Setting a proper mask is quite difficult.
Reducing blue channel's luminance does not show the expected outcome. I have to investigate and test a bit more.

Thanks again and very sorry for my late response :roll:

m