chore: Refactor preprocess function to always remove background and resize foreground image

app.py

@@ -55,12 +55,11 @@ def check_input_image(input_image):
         raise gr.Error("No image selected!")
 
 
-def preprocess(input_image, do_remove_background):
-    rembg_session = rembg.new_session() if do_remove_background else None
+def preprocess(input_image):
+    rembg_session = rembg.new_session()
 
-    if do_remove_background:
-        input_image = remove_background(input_image, rembg_session)
-        input_image = resize_foreground(input_image, 0.85)
+    input_image = remove_background(input_image, rembg_session)
+    input_image = resize_foreground(input_image, 0.85)
 
     return input_image
 
@@ -215,13 +214,9 @@ with gr.Blocks() as demo:
                             type="pil",
                             interactive=False
                         )
-                    with gr.Row():
-                        with gr.Group():
-                            do_remove_background = gr.Checkbox(
-                                label="Remove Background", value=True)
                     with gr.Row():
                         submit_process = gr.Button(
-                            "Process Image", elem_id="process", variant="primary")
+                            "Remove Background", elem_id="process", variant="primary")
                     with gr.Row(variant="panel"):
                         gr.Examples(
                             examples=[os.path.join("examples", img_name) for img_name in sorted(
@@ -273,11 +268,10 @@ with gr.Blocks() as demo:
     mv_images = gr.State()
 
     submit_prompt.click(fn=generate_image, inputs=[prompt], outputs=input_image).success(
-        fn=preprocess, inputs=[input_image, do_remove_background], outputs=[processed_image]
+        fn=preprocess, inputs=[input_image], outputs=[processed_image]
     )
     submit_process.click(fn=check_input_image, inputs=[input_image]).success(
-        fn=preprocess, inputs=[input_image,
-                               do_remove_background], outputs=[processed_image],
+        fn=preprocess, inputs=[input_image], outputs=[processed_image],
     )
     submit_mesh.click(fn=generate_mvs, inputs=[processed_image, sample_steps, sample_seed], outputs=[mv_images, mv_show_images]).success(
         fn=make3d, inputs=[mv_images], outputs=[