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diff --git a/src/trace/quantize.h b/src/trace/quantize.h
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+++ b/src/trace/quantize.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Quantization for Inkscape
+ *
+ * Authors:
+ *   Stéphane Gimenez <dev@gim.name>
+ *
+ * Copyright (C) 2006 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef __QUANTIZE_H__
+#define __QUANTIZE_H__
+
+#include "imagemap.h"
+
+/**
+ * Quantize an RGB image to a reduced number of colors.
+ */
+IndexedMap *rgbMapQuantize(RgbMap *rgbmap, int nrColors);
+
+#endif /* __QUANTIZE_H__ */