A good challenge. Thanks!
Here’s my 2 cents, with pre-dev build (lacam16n2) RT 5.10-512-g6b35d3746
My aim was to flatten the dynamic range and make that ocean water a bit more appealing 
Kite Surfer.nef.pp3 (31.8 KB)
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You obviously know Wellington, if you can nominate individual bays! 
This is Lyall Bay, immediatley after my joyflight and time at Wellington International Airport where I also got to delight in the USAF Globemaster visit. WLG is sandwiched between Lyall Bay to the South and Evans Bay to the North.
Yes, it was a southerly breeze.
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That’s a negative (
) - however there is significant foreshortening due to the telephoto effect. EXIF data gives a focus distance of just under 126 metres. I haven’t applied any lens-correction* and certainly no perspective correction, so what you observe may be down to imperfect optics.
- There are two reasons I haven’t applied lens correction:
- I haven’t tweaked my custom settings since the most recent update of lensfun
- This lens usually has very limited need for correction, in my experience, so I haven’t bothered with 1 just yet.
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2024-04-06_17-09-46.72_DSC6190.nef.xmp (16.1 KB)
first version darktable and second version GIMP with posterization and cartoon filter
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The original raw converted with imagemagick and -clahe to a .png with -quality 05, then rotated to the correct orientation with darktable
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ImageMagick’s -clahe converts the image to CIELab, operates on only the L channel, and converts back to the original colorspace. That’s fair enough.
We can get a more colourful output by applying -clahe to the RGB channels independently. Windows BAT syntax:
%DCRAW% -v -w -6 -O x.tiff 2024-04-06_17-09-46.72_DSC6190.nef
magick ^
x.tiff ^
-channel RGB ^
-separate ^
-clahe 10x10%%+1024+10 ^
+channel ^
-combine ^
-quality 40 c.jpg
The -clahe parameters are:
- 10x10% fairly small tiles, so the “high contrast” is very local.
- 1024 bins for a fairly high precision
- limit clipping to 10, a fairly high number for high local contrast. More usually this would be around 2.0 to 3.0.
The result c.jpg is:
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Seems like I’m rolling with the contrasty approach of the OP…
2024-04-06_17-09-46.72_DSC6190.nef.arp (14.3 KB)
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2024-04-06_17-09-46.72_DSC6190.nef.xmp (18.4 KB)
Second warmer try:
2024-04-06_17-09-46.72_DSC6190.nef.xmp (18.3 KB)
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2024-04-06_17-09-46-88.jpg.out.arp (11.9 KB)
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2024-04-06_17-09-46.72_DSC6190.nef.xmp (17.2 KB)
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OK, I’m a total Noob to post-processing. Your rendering is fantastic. Can this ‘CLAHE’ be achieved in Raw Therapee? I’m searching for articles/tutorials. Thanks!
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I’m not sure if RT supports ctl but I bet it could be used to create this sort of application in ART…
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A little late to the ball game.
darktable-4.7.0+1224
2024-04-06_17-09-46.72_DSC6190_16.nef.xmp (97.1 KB)
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