Colouring a Rainbow

Recently I photographed a rainbow, the photo itself is not very good. But I would like to highlight the arch so that it stands out better against the cloudy background. I tried different things, e.g. masking (but how do I mask an arch? which parameters are useful?) or colour balance RGB (but the rainbow contains all colours…). I have not found a satisfactory solution. What would be your approach?

This file is licensed Creative Commons, By-Attribution, Share-Alike.
2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF (13.2 MB)
2022-06-06 21-07-38 E-M10 24453 - Regenbogen_01.ORF.xmp (22.1 KB)

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A quick (and not very successful) attempt in GIMP, using a combination of luminosity masks, with an approximate selection and saturation adjustment.

I am sure others will do much better!

With RT 5.8-dev

20220630_E-M10 24453 - Regenbogen-RT.jpg.out.pp3 (15,5 KB)

nice shot, here my try with RT-dev:

2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF-1.jpg.out.pp3 (16,6 KB)

M.

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Thanks for posting
darktable 3.8.1


2022-06-06 21-07-38 E-M10 24453 - Regenbogen_03.ORF.xmp (24.2 KB)

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2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF.xmp (13.3 KB)

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2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF.xmp (17.5 KB)

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2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF.xmp (13.3 KB)

2022-06-06 21-07-38 E-M10 24453 - Regenbogen_01.ORF.xmp (13.8 KB)

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Darktable 3.8.1
Rainbow with drawn masks.


2022-06-06 21-07-38 E-M10 24453 - Regenbogen.ORF.xmp (21.8 KB)

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Thanks for all the input! There are a few ideas in there that I would never have thought of. I’m surprised that they all brighten up the foreground, which I think is superfluous and would rather cut off…

@Mattes i think, the foreground is important for this pic, to give it some depth. Cutting it, will show clouds and a rainbow only and the pic will turn to kind of boring.


My version in GIMP 2.10.24 Lab

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My version…

2022-06-06 21-07-38 E-M10 24453 - Regenbogen_01.ORF.xmp (19.3 KB)

@marter You are right, I was too much focused on the rainbow.
Thank you all for your input! It’s interesting to see how many different approaches are possible…