From d5441b93ffdc2eb97baaca9ff88015de2a4f44b2 Mon Sep 17 00:00:00 2001
From: Thomas Hoffmann <thomas.hoffmann@tualo.de>
Date: Thu, 11 Jun 2015 12:59:00 +0200
Subject: [PATCH] fixed channel check

---
 src/Matrix.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Matrix.cc b/src/Matrix.cc
index 21e2996..221b834 100755
--- a/src/Matrix.cc
+++ b/src/Matrix.cc
@@ -316,6 +316,10 @@ NAN_METHOD(Matrix::Brightness){
 
 	if (args.Length() == 2){
 		Matrix *self = ObjectWrap::Unwrap<Matrix>(args.This());
+
+		if(self->mat.channels() != 3)
+			NanThrowError("Image is no 3-channel");
+
 		cv::Mat image = self->mat;
 		cv::Mat new_image = cv::Mat::zeros( image.size(), image.type() );
 		double alpha = args[0]->NumberValue();