RT dehaze (Haze removal) module

Software RawTherapee
1

The current RT dev branch has a reviewed and enhanced Haze removal module.

On my system it’s ~2.5x speed now and memory usage of Haze removal is also reduced. It also got the Luminance mode from ART.

That was a nice ping-pong between Alberto and me. I stole some of his code (for example the Luminance mode), but also showed him some speedups and we found and fixed some bugs.
Just perfect :slight_smile:

Here’s an example of the new Luminance mode I stole from ART

First screenshot left without Haze removal, right Haze removal in standard mode

grafik
grafik1920×1080 1.21 MB

Now left again without Haze removal, right Haze removal in luminance mode

grafik
grafik1920×1080 1.1 MB

Another one, again left without Haze removal, right with Haze removal in standard mode

grafik
grafik1920×1080 2.3 MB

Now left again without Haze removal, right with Haze removal in luminance mode

grafik
grafik1920×1080 2.2 MB

14 Likes
2

Very nice @heckflosse and @agriggio. Looking forward to using it.

(Reminds me to work on my even-better™ dehaze filter but it is woefully slow and buggy.)

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So if I had to sum up luminance mode, is that it avoids the color tone shift that happens in standard mode. :+1:

1 Like
4

About speed: The current dehaze implementation in RT needs a bit less than one second to dehaze a 50 MPixel file on my rusty 8-core from 2013

5

I learnt something from your discussion on kernels but we all know that the G’MIC filter will never be at those speeds. :stuck_out_tongue_closed_eyes: I can only make it relatively fast given the constraints of the interpreter.

6

Fantastic, very useful that is preserves the color much closer.

7

I tried the new luminosity dehaze and it worked well.
I have no idea how the coding is done, but would it be easy to separate dehaze into 2 different sliders? One for the old method and one for luminosity? I think that using primarily the luminosity one and then a touch of the old method would yeild nice results.
Thoughts?