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diff --git a/lib/extras/metrics.h b/lib/extras/metrics.h
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+++ b/lib/extras/metrics.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_METRICS_H_
+#define LIB_EXTRAS_METRICS_H_
+
+#include <stdint.h>
+
+#include "lib/jxl/butteraugli/butteraugli.h"
+#include "lib/jxl/image_bundle.h"
+
+namespace jxl {
+
+// Computes p-norm given the butteraugli distmap.
+double ComputeDistanceP(const ImageF& distmap, const ButteraugliParams& params,
+                        double p);
+
+double ComputeDistance2(const ImageBundle& ib1, const ImageBundle& ib2,
+                        const JxlCmsInterface& cms);
+
+double ComputePSNR(const ImageBundle& ib1, const ImageBundle& ib2,
+                   const JxlCmsInterface& cms);
+
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_METRICS_H_