Update app.py

app.py

@@ -43,7 +43,8 @@ def visualize_slice(file_obj, slice_index):
 
 def update_slider(file_obj):
     _, num_slices = load_nrrd(file_obj)
-    return gr.update(maximum=num_slices-1, value=0)
+    middle_slice = num_slices // 2  # Calculate the middle slice
+    return gr.update(maximum=num_slices-1, value=middle_slice)  # Set the slider to start in the middle
 
 with gr.Blocks() as app:
     gr.Markdown("## NRRD Slice Visualizer")