From f04e2cfb9859d216e14f0106b638e5583c0b7343 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 14 Aug 2026 13:34:19 -0500
Subject: [PATCH] [core] Remove deprecated gamma_correct and gamma_uncorrect

---
 esphome/core/helpers.cpp | 17 -----------------
 esphome/core/helpers.h   |  9 ---------
 2 files changed, 26 deletions(-)

diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 8c4442f1b2..7819b07be8 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -710,23 +710,6 @@ bool base64_decode_int32_vector(const std::string &base64, std::vector<int32_t>
 
 // Colors
 
-float gamma_correct(float value, float gamma) {
-  if (value <= 0.0f)
-    return 0.0f;
-  if (gamma <= 0.0f)
-    return value;
-
-  return powf(value, gamma);  // NOLINT - deprecated, removal 2026.9.0
-}
-float gamma_uncorrect(float value, float gamma) {
-  if (value <= 0.0f)
-    return 0.0f;
-  if (gamma <= 0.0f)
-    return value;
-
-  return powf(value, 1 / gamma);  // NOLINT - deprecated, removal 2026.9.0
-}
-
 void rgb_to_hsv(float red, float green, float blue, int &hue, float &saturation, float &value) {
   float max_color_value = std::max({red, green, blue});
   float min_color_value = std::min({red, green, blue});
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index 994fa2c26a..6b8f9ab7e8 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -1627,15 +1627,6 @@ bool base64_decode_int32_vector(const std::string &base64, std::vector<int32_t>
 /// @name Colors
 ///@{
 
-/// Applies gamma correction of \p gamma to \p value.
-// Remove before 2026.9.0
-ESPDEPRECATED("Use LightState::gamma_correct_lut() instead. Removed in 2026.9.0.", "2026.3.0")
-float gamma_correct(float value, float gamma);
-/// Reverts gamma correction of \p gamma to \p value.
-// Remove before 2026.9.0
-ESPDEPRECATED("Use LightState::gamma_uncorrect_lut() instead. Removed in 2026.9.0.", "2026.3.0")
-float gamma_uncorrect(float value, float gamma);
-
 /// Convert \p red, \p green and \p blue (all 0-1) values to \p hue (0-360), \p saturation (0-1) and \p value (0-1).
 void rgb_to_hsv(float red, float green, float blue, int &hue, float &saturation, float &value);
 /// Convert \p hue (0-360), \p saturation (0-1) and \p value (0-1) to \p red, \p green and \p blue (all 0-1).