He was the one to translate Winnie the Pooh to Hungarian, and was also a great writer and parodist in his own right.
I happen to have attended Karinthy Frigyes Gimnázium 
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One more from me, taking some ideas from your contributions. I think it was @anon42681393 who used color calibration with grey mixing, blended for the blue channel.
2023-03-10_19-12-33_P1080015_09.RW2.xmp (21.1 KB)
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Best I could do. Chose blue and set to grain extract with original layer on base and copy of original layer above the grain extract layer set to Lhc Lightness. Did some selective blends to get some blue back on certain things as well.
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Turns out that no-one wants to see the blue led light shining through as seen in my previous reply. This is a nice image to play with so I spend a bit more time using a somewhat different approach.
Blues be gone!
RawTherapee 5.9 dev
Not sure if I should have pushed the chromaticity/saturation up a notch or two, decided against it in the end.
PS: The sidecar should work on normal, stable RT 5.9. No dev and/or mergers needed 
4 Likes
As I just ended work I was ready to give it a try but at the same time I thought if you had the time to try you’d nail it, and sure you did !
As some other did.
Congrats 
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2023-03-10_19-12-33_P1080015_02.RW2.xmp (18.1 KB)
One simple version and a second with a hue shift applied…
Ironically landed on it messing with the base curve…
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Very well done, Todd!
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ART
Not quite satisfied with first trial. went more neutral. Not sure this one is better! These blue leds are a nightmare!
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2023-03-10_19-12-33_P1080015.RW2.xmp (32.7 KB)
I though it would be fun … pushed to the extremes, colour correction is not so stable… or I do not know how to manage it properly. Ended up fixing patches with look-up table
Multiple directions, one can take here. Appreciate this very interesting image with difficult lighting conditions. I tried to concentrate on the skin tones and then give a plausible colors to the other parts of the image.
2023-03-10_19-12-33_P1080015_01.RW2.xmp (35.5 KB)
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Wow, seems like the Tone Equalizer did some very nice clean-up!
If you are taking about @s7habo , then I don’t think he did use the tone eq at all in his edit… just looked at the history stack…
I think the wizard here is the channel mixer… ie using the color calibration module…
Not that this is a good or final edit but you can deal with a lot of the blue…
Only 2 modules here on top of legacy WB…as shot . The skin tones would need some work and other parts but that could be done to taste. This uses the blue channel in gray tab but you can also get a nice fix working the blue channel in the channel mixer tab…
2 Likes
In that case, I’ll be looking for anything that is labeled as a channel mixer, or has a similar function in my available software (RawTherapee, GIMP).
Thanks!
István, thank you!
(I had only noticed the one in RawTherapee.)
