I haven’t had the chance to try Affinity yet, but this method should work the same across all apps, unless there’s something fundamentally different about how they resolve their Curves or Histogram adjustments.
So I just gave it a try using your guide and sample .tif and all worked well! This will most likely save me quite a bit of money spending on Capture One and force me into actually learning something new.
You’re a Godsend with such guides, truly! Thank you.
Dmitri
Krystian
Dmitri