Refactor image saving logic in app.py

app.py

@@ -105,10 +105,7 @@ with gr.Blocks(css=css) as demo:
             pred_depth = pred_depth.cpu().numpy().squeeze()
             output_image = plt.imsave('depth.png', pred_depth, cmap='jet')
 
-            tmp = tempfile.NamedTemporaryFile(suffix='.png', delete=False)
-            output_image.save(tmp.name)
-
-            return [(original_image, output_image), tmp.name]
+            return [(original_image, output_image), output_image]
 
     submit.click(on_submit, inputs=[input_image], outputs=[
                  depth_image_slider, raw_file])