diff --git a/src/aliceVision/hdr/rgbCurve.cpp b/src/aliceVision/hdr/rgbCurve.cpp
index f16de1caaf..6c9dddb7de 100644
--- a/src/aliceVision/hdr/rgbCurve.cpp
+++ b/src/aliceVision/hdr/rgbCurve.cpp
@@ -268,53 +268,6 @@ void rgbCurve::setAllAbsolute()
     }
 }
 
-inline float gammaFunction(float value, float gamma)
-{
-    // 1/0.45 = 2.22
-    if (value < 0.018)
-    {
-        return 4.5 * value;
-    }
-    else
-    {
-        return 1.099 * std::pow(value, 0.45) - 0.099;
-    }
-}
-
-inline float inverseGammaFunction(float value, float gamma)
-{
-    if (value <= 0.0812f)
-    {
-        return value / 4.5f;
-    }
-    else
-    {
-        return pow((value + 0.099f) / 1.099f, gamma);
-    }
-}
-
-void rgbCurve::applyGamma(float gamma)
-{
-    for (auto &curve : _data)
-    {
-        for (auto &value : curve)
-        {
-            value = gammaFunction(value, gamma);
-        }
-    }
-}
-
-void rgbCurve::applyGammaInv(float gamma)
-{
-    for (auto &curve : _data)
-    {
-        for (auto &value : curve)
-        {
-            value = inverseGammaFunction(value, gamma);
-        }
-    }
-}
-
 void rgbCurve::normalize()
 {
     for(auto &curve : _data)
diff --git a/src/aliceVision/hdr/rgbCurve.hpp b/src/aliceVision/hdr/rgbCurve.hpp
index 29edf235bb..b3aa8ae8ca 100644
--- a/src/aliceVision/hdr/rgbCurve.hpp
+++ b/src/aliceVision/hdr/rgbCurve.hpp
@@ -207,10 +207,6 @@ class rgbCurve
     */
   void setAllAbsolute();
 
-  void applyGamma(float gamma = 2.2);
-
-  void applyGammaInv(float gamma = 2.2);
-
   /**
     * @brief normalize the curve
     */