From c3753fa6ff8423fd9e299413530911d6fb42c104 Mon Sep 17 00:00:00 2001
From: Desmis <jdesmis@gmail.com>
Date: Mon, 13 Jul 2020 17:51:49 +0200
Subject: [PATCH] Enable curve C=f(H)

---
 rtengine/iplocallab.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index d2cbe949e..82b8b66f2 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -13754,6 +13754,15 @@ void ImProcFunctions::Lab_Local(
 
                             }
 
+
+                            if (locchCurve && CHutili && lp.qualcurvemet != 0) {//C=f(H) curve
+                                const float rhue = xatan2f(bufcolcalcb, bufcolcalca);
+                                const float valparam = locchCurve[500.f * Color::huelab_to_huehsv2(rhue)] - 0.5f;  //get valp=f(H)
+                                float chromaChfactor = 1.0f + valparam;
+                                bufcolcalca *= chromaChfactor;//apply C=f(H)
+                                bufcolcalcb *= chromaChfactor;
+                            }
+
                             if (ctoning) {//color toning and direct change color
                                 if (lp.gridmet == 0) {
                                     bufcolcalca += kd * bufcolcalcL * a_scale + a_base;