Update app.py

app.py

@@ -7,16 +7,19 @@ def image_to_svg(image, colormode, hierarchical, filter_speckle, color_precision
     """
     Converts an input image to an SVG string using vtracer.
     This function is triggered automatically when any of the input controls change.
+    It now includes robust error handling to prevent the app from freezing.
     """
     if image is None:
         return None, "Upload an image to see the SVG preview and code.", None
 
     input_path = image
     
+    # Create a persistent temporary file that Gradio can access.
     with tempfile.NamedTemporaryFile(delete=False, suffix=".svg", mode='w', encoding='utf-8') as temp_output_file:
         output_path = temp_output_file.name
 
     try:
+        # vtracer conversion call with all parameters from the UI.
         vtracer.convert_image_to_svg_py(
             input_path,
             output_path,
@@ -33,13 +36,24 @@ def image_to_svg(image, colormode, hierarchical, filter_speckle, color_precision
             max_iterations=10
         )
 
+        # If successful, read the generated SVG content to display.
         with open(output_path, "r", encoding='utf-8') as f:
             svg_content = f.read()
         
         return output_path, svg_content, output_path
 
+    # **THE FIX for Error Handling:**
+    # Catch any exception from the vtracer process.
     except Exception as e:
-        error_message = f"An error occurred during conversion: {str(e)}"
+        # Create a user-friendly error message.
+        error_message = (
+            f"⚠️ Conversion Failed\n\n"
+            f"An error occurred in the backend. This can happen with certain image types or extreme parameter values.\n\n"
+            f"Please try adjusting the settings or use a different image.\n\n"
+            f"Details: {str(e)}"
+        )
+        # Return clean outputs and display the error message in the code block.
+        # This prevents the app from getting stuck.
         return None, error_message, None
 
 
@@ -71,9 +85,10 @@ with gr.Blocks(theme=gr.themes.Soft(primary_hue="blue")) as demo:
                 hierarchical = gr.Radio(["Stacked", "Cutout"], value="Stacked", label="Hierarchical Mode")
                 filter_speckle = gr.Slider(0, 128, value=4, step=1, label="Filter Speckle (Cleaner)")
                 
-                # **THE FIX:** The vtracer backend panics if color_precision is 8 or greater.
-                # The valid range is 0-7. This slider now enforces that constraint.
-                color_precision = gr.Slider(0, 7, value=6, step=1, label="Color Precision (More accurate)")
+                # **THE FIX for Parameter Range:**
+                # The vtracer backend panics if color_precision is 0.
+                # The valid range is 1-8. This slider now enforces that constraint.
+                color_precision = gr.Slider(1, 8, value=6, step=1, label="Color Precision (More accurate)")
                 
                 layer_difference = gr.Slider(0, 128, value=16, step=1, label="Gradient Step (Less layers)")