Update app_3.py

app_3.py

@@ -1501,7 +1501,7 @@ def process_image(input_image, input_text):
             
             # Create RGBA image with default 255 alpha
             alpha = np.zeros((H, W, 1), dtype=np.uint8)
-            alpha[~first_mask] = 128 # Set semi-transparency for background
+            alpha[~first_mask] = 0 # 128 for semi-transparency background
             alpha[first_mask] = 255 # Make the foreground opaque
             alpha = alpha.squeeze(-1) # Remove singleton dimension to become 2D
             rgba = np.dstack((img, alpha)).astype(np.uint8)