Hi Halina3000. I have encountered the same problem. Red flowers can be problematic. Many digital camera sensors have difficulty detecting subtleties at the red end of the spectrum. I’ve never been able to get truly satisfactory results when photographing red flowers. I end up having to make do with less than perfect. Some tweaking in Darktable or similar can sometimes help slightly, but unfortunately, there’s nothing much that can be done to obtain faithful realism when colour information is actually missing, due to the camera sensor’s limitations.
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I found that the red channel gets blown easily with red flowers, and that makes editing afterwards difficult.
In addition, there may be a bit of UV in many flower colours, which the camera can detect (as blue), but we don’t.
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The gamut compression slider in CC module can help and the colorfulness sliders also are nice to apply to help tweak those gamut/saturation issues
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Here’s my attempt. Tweaking color calibration to bring the blooms in line helped a lot
IMG_7089.CR2.xmp (11.2 KB)
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Edited in Gimp.
I lowered the exposure by about one stop and lifted the green channel using the red channel in brighten mode, then i blended the two layers in luminosity mode.
Hard to get a good contrast without blow out the reds and keep colors in gamut.
I see this topic has come back to life again 
Give it another month or so and I should be able to compare with the real thing again.
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Not sure how many of these edit were done with the default DT web safe srgb profile… It seems geared to offer a perceptual rendering intent and although you can select rendering intents I am almost certain it doesn’t have the luts to render them… Switching to an icc from icc consortium you can change the rendering intent which in the case of flowers will also change the result…
Here are 4 exports of my edit… First one is perceptual with DT srgb profile and the second is relative…they seem the same and the next two are with the icc from the icc consortium…First one perceptual which is a good match for the 2 from DT and the last is rendered as relative and I actually like how it renders in this case…
IMG_7089.CR2.xmp (9.1 KB)
sRGB_v4_ICC_preference.icc (59.5 KB)
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Todd, they all look about the same to me. You embedded the relevant profile in each (proper practice), and most browsers are going to convert the image to sRGB (default) for rendition.
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The first 3 should be the same…you don’t see a difference on the last one???
How about in this screen shot…
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@priort, Thank you for the sRGB_v4_ICC_preference.icc from www.color.org. Different rendering intent do result in different rendering.
I do see a difference between the last two frames, also in original post, on my monitor.
They have another one on the same page called appearance… this one is supposed to help preserve color when there are color space conversions at least I think this is what it is for… its gives a slightly different result not sure I fully understand the difference between those two and this newer iccmax yet… Might have to read a bit to fully understand it…
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Bottom one is a teeny bit darker. Hues look the same though…
Ya I think close with the upper one tending to be a bit more towards a pink…
IMG_7089.CR2.xmp (20.7 KB)
I tweaked color calibration until the flowers became red. I had to drop saturation afterwards. filmic v6, with preserve chorminance in luminance Y mode.
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Brightened the flowers; darkened the leaves. Also pushed the green more in the leaves. Added some gloss to the flower petals.
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Halina3000,
Further to my previous comment, I’ve also noticed that camera lenses can differ considerably in how well they convey colours at the red end of the spectrum. I suspect that some lenses filter out some light frequencies to some extent. So it might be worth trying a different lens or two, and comparing the results, if you can’t resolve the issue to your satisfaction in post-processing.
I’m curious about that, having assumed my entire lens collection is “achromatic”. If you have a couple of example shots I’d be interested in examining them.
Even on my phone they look different here.
The first 3 have a more magenta thing going on.
It is subtle on one hand , yet next to each other very clearly visible on the other …