fix value error

app.py

@@ -26,30 +26,32 @@ format_options = {
 }
 
 
-def convert_image(img_file, output_format,
-                  quality, compress_level,
-                  jpeg2000_layers, avif_speed,
-                  subsampling, professional_lossless):
-    # img_file is now a path (string or Path)
+def convert_image(
+    img_file, output_format,
+    quality, compress_level,
+    jpeg2000_layers, avif_speed,
+    subsampling, professional_lossless
+):
+    # img_file is a filesystem path (string)
     img_path = Path(img_file)
     img_bytes = img_path.read_bytes()
 
     # Load image and convert to RGB
     image = Image.open(io.BytesIO(img_bytes)).convert("RGB")
 
-    save_kwargs = {}
+    # Prepare save kwargs
     fmt = output_format
+    save_kwargs = {}
 
     if professional_lossless:
         # Force true lossless: use PNG
         fmt = "PNG"
         save_kwargs.update({"compress_level": 9, "optimize": True})
     else:
-        # Base defaults
-        opts = format_options.get(fmt, {})
-        save_kwargs.update(opts)
+        # Base defaults for chosen format
+        save_kwargs.update(format_options.get(fmt, {}))
 
-        # Override with specialized controls
+        # Overrides per-format
         if fmt == "JPEG":
             save_kwargs["quality"] = quality
         elif fmt == "WEBP":
@@ -67,31 +69,35 @@ def convert_image(img_file, output_format,
             save_kwargs["quality"] = quality
             save_kwargs["subsampling"] = subsampling
 
+    # Save into a bytes buffer
     buf = io.BytesIO()
     image.save(buf, format=fmt, **save_kwargs)
     buf.seek(0)
     return buf.getvalue()
 
 
-# Build Gradio app
 def build_app():
     with gr.Blocks() as demo:
         gr.Markdown("# Advanced Image Converter")
 
         with gr.Row():
-            # Return a filesystem path instead of raw bytes
-            inp = gr.File(label="Upload Image", file_types=["image"], type="file")
+            # Use 'filepath' so Gradio returns a local file path string
+            inp = gr.File(label="Upload Image", file_types=["image"], type="filepath")
             out = gr.File(label="Download Converted")
 
         with gr.Row():
-            fmt = gr.Dropdown(choices=offered_formats, value="PNG", label="Output Format")
+            fmt = gr.Dropdown(offered_formats, value="PNG", label="Output Format")
         with gr.Row():
-            quality = gr.Slider(1, 100, value=85, step=1, label="Quality (JPEG/AVIF/HEIF/WEBP)")
-            compress = gr.Slider(0, 9, value=6, step=1, label="PNG Compress Level")
+            quality = gr.Slider(1, 100, value=85, step=1,
+                                label="Quality (JPEG/AVIF/HEIF/WEBP)")
+            compress = gr.Slider(0, 9, value=6, step=1,
+                                 label="PNG Compress Level")
         with gr.Row():
-            jpeg2000_layers = gr.Textbox(value="25,50,75", label="JPEG2000 Quality Layers (comma-separated)")
+            jpeg2000_layers = gr.Textbox(value="25,50,75",
+                                         label="JPEG2000 Quality Layers (comma-separated)")
             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")
+        subsample = gr.Dropdown(["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")
         convert_btn = gr.Button("Convert")