diff --git a/ccv/sheet3/exercise3.cpp b/ccv/sheet3/exercise3.cpp
index 70bd9ca..2e19f61 100644
--- a/ccv/sheet3/exercise3.cpp
+++ b/ccv/sheet3/exercise3.cpp
@@ -13,6 +13,7 @@ int main(int argc, char** argv ) {
   cv::cvtColor(image, image_gray, cv::COLOR_BGR2GRAY);
   cv::Mat image_float;
   image_gray.convertTo(image_float, CV_32F);
+  cv::Mat image_write;
 
   cv::Mat G_1;
   cv::Mat G_2;
@@ -21,6 +22,8 @@ int main(int argc, char** argv ) {
   cv::Mat image_filtered = G_1 - G_2;
 
   cv::imshow("Filtered (3 - 11)", image_filtered);
+  image_write = image_filtered * 255;
+  cv::imwrite("Filter-3-11.jpg", image_write);
   cv::waitKey(0);
 
   cv::GaussianBlur(image_float, G_1, cv::Size(3, 3), 3, 3, cv::BORDER_CONSTANT);
@@ -28,6 +31,8 @@ int main(int argc, char** argv ) {
   image_filtered = G_1 - G_2;
 
   cv::imshow("Filtered (3 - 7)", image_filtered);
+  image_write = image_filtered * 255;
+  cv::imwrite("Filter-3-7.jpg", image_write);
   cv::waitKey(0);
 
   cv::GaussianBlur(image_float, G_1, cv::Size(3, 3), 5, 5, cv::BORDER_CONSTANT);
@@ -35,6 +40,8 @@ int main(int argc, char** argv ) {
   image_filtered = G_1 - G_2;
 
   cv::imshow("Filtered (5 - 7)", image_filtered);
+  image_write = image_filtered * 255;
+  cv::imwrite("Filter-5-7.jpg", image_write);
   cv::waitKey(0);
 
   cv::GaussianBlur(image_float, G_1, cv::Size(3, 3), 11, 11, cv::BORDER_CONSTANT);
@@ -43,6 +50,8 @@ int main(int argc, char** argv ) {
   image_float.convertTo(image_gray, CV_8U);
 
   cv::imshow("Filtered (11 - 3)", image_filtered);
+  image_write = image_filtered * 255;
+  cv::imwrite("Filter-11-3.jpg", image_write);
   cv::waitKey(0);
 
   cv::GaussianBlur(image_float, G_1, cv::Size(3, 3), 9, 9, cv::BORDER_CONSTANT);
@@ -50,6 +59,8 @@ int main(int argc, char** argv ) {
   image_filtered = G_1 - G_2;
 
   cv::imshow("Filtered (9 - 5)", image_filtered);
+  image_write = image_filtered * 255;
+  cv::imwrite("Filter-9-5.jpg", image_write);
   cv::waitKey(0);
 }