Update app.py

app.py

@@ -58,7 +58,9 @@ def update_slider(file_obj, view):
         num_slices = data.shape[1]
     elif view == "Sagittal":
         num_slices = data.shape[0]
-    return gr.update(maximum=num_slices-1, value=0)
+    # Set slider to start in the middle
+    middle_slice = num_slices // 2
+    return gr.update(maximum=num_slices-1, value=middle_slice)
 
 with gr.Blocks() as app:
     gr.Markdown("## NRRD Slice Visualizer")