https://bugs.kde.org/show_bug.cgi?id=385845
Bug ID: 385845
Summary: [proposal] Add Film-like curve adjustment to keep
constant hue during curves adjustment
Product: krita
Version: 3.3.1
Platform: Other
OS: All
Status: UNCONFIRMED
Severity: wishlist
Priority: NOR
Component: adjustment layers
Assignee: krita-bugs-n...@kde.org
Reporter: ene...@gmail.com
Target Milestone: ---
During regular curves adjustment hues are shifted especially blues and yellows.
This problem can be solved using Film-like curve originally created by Adobe:
(So how does actually Adobe’s tone curve work? It’s an RGB curve where the tone
curve is applied on the largest and smallest value, and then the middle value
is adapted to keep a constant hue as defined by RGB-HSL/HSV. In terms of look
and saturation increase it’s very similar to a pure RGB curve, more so than a
HSL-L curve or HSV-V curve, but some color shift problems are avoided.)
from: https://www.ludd.ltu.se/~torger/dcamprof.html#tone_curves
This feature is implemented in RawTherapee and currently in Natron. It also
fits Krita where linear workflow is used for painting. With this curve type hue
shifts can be avoided during final curves adjustment using adjustment layers.
http://rawpedia.rawtherapee.com/Exposure#Film-Like
Additional reading:
http://scribble-jpc.blogspot.com/2012/09/in-search-of-perfect-color-new-tone.html
Source (AdobeToneCurve)
https://github.com/Beep6581/RawTherapee/blob/dev/rtengine/curves.h
https://github.com/Beep6581/RawTherapee/blob/dev/rtengine/curves.cc
Sidenote: there are also more curve types available inside source that can be
implemented along adobe type.
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