David,
I'm not at my desktop right now, but I would imagine that you would, as you
suggested, use two graduated density filters together.
Theoretically, you would create one filter with a really short transition
(the hard edge portion) to delineate the horizon (I'm assuming it's a
landscape you're trying to process, but it may not be so).
Then, you would add a second graduated density module, and orient the
filter to the same position and angle as the first instance. But this one,
you have a soft (wide) transition.
Jointly, the two filters should give you what you are looking for.
Cheers,
Bruce Williams.

---------- Forwarded message ---------
From: Bill Martz <[email protected]>
Date: Sun, 9 Aug 2020, 03:44
Subject: Re: [darktable-user] Gradient mask question
To: David Vincent-Jones <[email protected]>
Cc: darktable forum <[email protected]>


I don't see an answer to your question yet, so here's a demo from your
Black Printing Problem post:

Regards,
Bill Martz

On Thu, Jul 30, 2020 at 7:42 PM David Vincent-Jones <[email protected]>
wrote:

> I am looking for the way to place a hard limit to the mask on the maximum
> side. If I remember correctly this can be done with 2 masks used together
> but I forgot how it works.
>
> I need to start a mask with full density at a specific part of the image
> and then fade the mask away from that line. Does somebody remember how that
> works?
>
> David
>
> ..... and before somebody asks the question ... Manjaro/Arch/XFCE/daily git
>
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>

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