fix: return file paths from process_faceless to bypass Gradio image conversion

app.py

@@ -20,11 +20,23 @@ def process_faceless(input_image, prompt="", negative_prompt=""):
             negative_prompt=negative_prompt or "shading, realism, messy lines, noisy, double lines, background clutter"
         )
         lineart, cutout = build_faceless_embroidery_assets(input_image, cfg)
-        return lineart, cutout
+        
+        # Save to temp files to preserve RGBA transparency channels
+        lineart_path = os.path.join(tempfile.gettempdir(), f"lineart_{os.getpid()}_{os.urandom(4).hex()}.png")
+        cutout_path = os.path.join(tempfile.gettempdir(), f"cutout_{os.getpid()}_{os.urandom(4).hex()}.png")
+        
+        lineart.save(lineart_path, "PNG")
+        if cutout:
+            cutout.save(cutout_path, "PNG")
+            return lineart_path, cutout_path
+        else:
+            return lineart_path, None
     except Exception as e:
         print(f"[ERRO] process_faceless: {e}")
-        # Fallback: retorna a imagem original e uma mensagem de erro
-        return input_image, None
+        # Save original to temp file to be safe
+        orig_path = os.path.join(tempfile.gettempdir(), f"orig_{os.getpid()}.png")
+        input_image.save(orig_path, "PNG")
+        return orig_path, None
 
 # Interface Gradio
 demo = gr.Interface(