How to "de-darken" lines ?

[Platos]

For example there is a line-filter for Vapoursynth in Hybrid called Darken GLSL A4k where you can use to darken lines. In theory shouldn't it be possible to de-darken with the same filter with negative values ? But it does not work with this filter for me.

So does someone know a de-darken filter?

[poisondeathray]

For example there is a line-filter for Vapoursynth in Hybrid called Darken GLSL A4k where you can use to darken lines. In theory shouldn't it be possible to de-darken with the same filter with negative values ? But it does not work with this filter for me.

So does someone know a de-darken filter?

What do you mean it "does not work" ? In the GUI ?

If it's an anime4k glsl shader, you can edit the values in notepad for any glsl shader, save it under a new descriptive name

Negative values "work" for line darken shader strength , but they can blur the lines - it makes sense because line darkening filters also tend to darken and thicken the lines



Another approach is to use a line mask, and composite a "lightened" version (such as with levels) using overlay

[Platos]

Yes, i meant the gui from hybrid.

Ah ok, i thought it just would evenly make the line a bit less dark. But maybe i try it somehow.

Ok, mask would also be an option. For masks i need 2 sources, right? Im not sure anymore.

[Selur]

Yes, Hybrid uses Anime4K_Darken_*.glsl, but Hybrid does only allow negative values, since - to me - that does not make sense for a darkening filter (https://imgsli.com/MTc2ODM5).
Using Levels with an EdgeMask while changing the gamma, seems to a better approach.
If you mess with the glsl file, make a copy of it and rename the copy, keep the original, otherwise Hybrids UI integration of the filter might not work.

Cu Selur

[Platos]

Ah ok, yeah i mean if it looks so bad i will not try it xD

That seems just not to work good.

Maybe i have to try masking. I will have to look into this masking stuff. Is complicatet.

[Selur]

The basic idea of masking is easy, you have two versions of a clip, for exampled a filtered and an unfiltered one.
Then you have a mask (either grayscale or black and white) which defines per pixel where and how much of the first version of the clip should be replaced by the second version.
Original:

Filtered:

Mask:

Filtered with Mask:


If the pixel is white (=1) in the mask, then the pixel in the 1st source will be replaced with the pixel in the 2nd source.
If the pixel is black (=6) in the mask, then the pixel in the 1st source will be kept.
If the pixel is gray (0 < x < 1) in the mask, then the pixel in the 1st source will be mixed with the pixel in the 2nd source.


Cu Selur

Ps.: The tricky part is creating the right mask that covers only the areas you want.

[Platos]

Ahh, ok, that's nice.

So which filter did you use for this masking ? negative value forDarken GLSL A4k ?

[Selur]

Levels with gamma set to 1.5 and for the mask I used 'EdgeMask (Prewitt)'.