diff --git a/code/nel/include/nel/misc/rgba.h b/code/nel/include/nel/misc/rgba.h
index db9ed892a..7929b4545 100644
--- a/code/nel/include/nel/misc/rgba.h
+++ b/code/nel/include/nel/misc/rgba.h
@@ -146,6 +146,14 @@ public:
 	 */
 	uint8 toGray() const;
 
+	/**
+	 * Color is gray
+	 */
+	bool isGray() const
+	{
+		return R == G && G == B;
+	}
+
 	/**
 	 * Get a 16 bits 565 pixel.
 	 */