Update app.py

app.py

@@ -22,14 +22,13 @@ def filter_img(input_img,filter_type):
     
     img = cv2.resize(img, (new_width,new_height))
     
-    filtered_img = np.zeros(img.shape, dtype=int)
+    filtered_img = np.zeros_like(img)
     
     if filter_type == 'Vintage':
-        sepia_filter = np.array(
-            [[0.393, 0.769, 0.189], [0.349, 0.686, 0.168], [0.272, 0.534, 0.131]]
-        )
-        filtered_img = img.dot(sepia_filter.T)
-        filtered_img /= filtered_img.max()
+        gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+        filtered_img[:,:,0] = (gray_img * 0.393) + (gray_img * 0.769) + (gray_img * 0.189)
+        filtered_img[:,:,1] = (gray_img * 0.349) + (gray_img * 0.686) + (gray_img * 0.168)
+        filtered_img[:,:,2] = (gray_img * 0.272) + (gray_img * 0.534) + (gray_img * 0.131)
     elif filter_type == 'Gray-sharp':
         img = cv2.cvtColor(img,cv2.COLOR_RGB2GRAY)
         filtered_img = cv2.addWeighted(img,4, cv2.blur(img,(128,128)),-4,128)