fix type error

app.py

@@ -25,10 +25,14 @@ format_options = {
 }
 
 
-def convert_image(img_bytes, output_format,
+def convert_image(img_file, output_format,
                   quality, compress_level,
                   jpeg2000_layers, avif_speed,
                   subsampling, professional_lossless):
+    # Read the uploaded file as bytes
+    with open(img_file, "rb") as f:
+        img_bytes = f.read()
+
     # Load image and convert to RGB
     image = Image.open(io.BytesIO(img_bytes)).convert("RGB")
 
@@ -54,7 +58,6 @@ def convert_image(img_bytes, output_format,
             save_kwargs["compress_level"] = compress_level
             save_kwargs["optimize"] = True
         if fmt == "JPEG2000":
-            # quality_layers expects list of ints
             save_kwargs["quality_layers"] = [int(l) for l in jpeg2000_layers.split(",")]
         if fmt == "AVIF":
             save_kwargs["quality"] = quality
@@ -68,6 +71,7 @@ def convert_image(img_bytes, output_format,
     buf.seek(0)
     return buf.getvalue()
 
+
 # Build Gradio app
 def build_app():
     with gr.Blocks() as demo:
@@ -87,7 +91,7 @@ def build_app():
             avif_speed = gr.Slider(0, 8, value=4, step=1, label="AVIF Speed")
         subsample = gr.Dropdown(choices=["4:4:4", "4:2:2", "4:2:0"], value="4:2:0", label="HEIF Subsampling")
         professional = gr.Checkbox(label="Professional Lossless Mode",
-                                  info="Force highest-quality lossless conversion as optimized PNG")
+                                   info="Force highest-quality lossless conversion as optimized PNG")
         convert_btn = gr.Button("Convert")
 
         convert_btn.click(
@@ -99,6 +103,7 @@ def build_app():
         )
     return demo
 
+
 if __name__ == "__main__":
     app = build_app()
     app.launch()