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diff --git a/third_party/jpeg-xl/lib/jxl/enc_gamma_correct.h b/third_party/jpeg-xl/lib/jxl/enc_gamma_correct.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_gamma_correct.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_ENC_GAMMA_CORRECT_H_
+#define LIB_JXL_ENC_GAMMA_CORRECT_H_
+
+// Deprecated: sRGB transfer function. Use color_management.h instead.
+
+#include <cmath>
+
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/transfer_functions-inl.h"
+
+namespace jxl {
+
+// Values are in [0, 1].
+static JXL_INLINE double Srgb8ToLinearDirect(double srgb) {
+  if (srgb <= 0.0) return 0.0;
+  if (srgb <= 0.04045) return srgb / 12.92;
+  if (srgb >= 1.0) return 1.0;
+  return std::pow((srgb + 0.055) / 1.055, 2.4);
+}
+
+// Values are in [0, 1].
+static JXL_INLINE double LinearToSrgb8Direct(double linear) {
+  if (linear <= 0.0) return 0.0;
+  if (linear >= 1.0) return 1.0;
+  if (linear <= 0.0031308) return linear * 12.92;
+  return std::pow(linear, 1.0 / 2.4) * 1.055 - 0.055;
+}
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_GAMMA_CORRECT_H_