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diff --git a/lib/extras/hlg.h b/lib/extras/hlg.h
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+++ b/lib/extras/hlg.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_EXTRAS_HLG_H_
+#define LIB_EXTRAS_HLG_H_
+
+#include "lib/jxl/image_bundle.h"
+
+namespace jxl {
+
+float GetHlgGamma(float peak_luminance, float surround_luminance = 5.f);
+
+Status HlgOOTF(ImageBundle* ib, float gamma, ThreadPool* pool = nullptr);
+
+Status HlgInverseOOTF(ImageBundle* ib, float gamma, ThreadPool* pool = nullptr);
+
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_HLG_H_