diff --git a/src/image.cpp b/src/image.cpp
index b9c5e88..4787b85 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -5,7 +5,10 @@ Image::Image () {
 }
 
 Mat Image::getBlank () {
-	return Mat::zeros(height, width, CV_8UC3);
+	if (blank.empty()) {
+		blank = Mat::zeros(height, width, CV_8UC3);
+	}
+	return blank;
 }
 
 Mat Image::loadImage (string& image_path, uint64_t& x, uint64_t& y, uint64_t& w, uint64_t& h) {