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Hi Stephane
As a general rule, I will always do a 'simple' process to use as a reference.
Any fancy processing after that either makes it better...or worse.
In order:
Crop out stacking artefacts.
Background extraction: ABE or DBE
Noise reduction: EZ Denoise Script (default settings). It is important to get rid of noise in the linear stage.
Stretch:
Apply Screen Transfer Function (SCF) using the default settings.
Open Histogram Transformation (HT) and select your image.
Drag the SCF triangle to the bottom of HT.
Apply HT (square button) and then reset it (bottom right).
Reset and close SCF, it has done it's job.
Your image is now non linear.
In HT look at the graph and zoom in. Move the curve to the left until clipping starts. A small amount of clipping is fine (maybe up to a few 1000 pixels).
Apply HT (square button) and reset.
Zoom the image (so you can see the noise)and work on the right side of the HT graph (pulling it down).
Pull the graph down a TINY amount and then apply (square button).
Do this until the noise is reduced (don't over do it).
Save it off.
Curves: I always give a hint of saturation.
That's it, that is your reference image.
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