darktable 2.7 strange margin - bug?

[pk5dark (Christian Kanzian)]

I can’t reproduce this. Do you use a self created preset in profiled denoise?

Profiled denoise has received a massive overhaul, which thankfully makes all old “tricks” needless:

Changes in noise reduction for darktable 2.7/3.0

This post aims at describing the changes I made since January in darktable for noise reduction. Context: how does the denoise profiled works What is the profile? A profile is a set of a few parameters (2 per channel and per ISO value in our case) that describe the way the noise variance change depending on luminosity. Variance is a measure of the dispersion of values around the mean: in our case it gives information on how far the values of the noisy pixels can be from the values they should…