Add application files.

app.py

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+import gradio as gr
+import os
+import tempfile
+from PIL import Image
+import pillow_heif
+import numpy as np
+
+def convert_heic_to_png(heic_file):
+    """
+    Convert HEIC image to PNG format with lossless compression
+    
+    Args:
+        heic_file (str): Path to the HEIC file
+        
+    Returns:
+        str: Path to the converted PNG file
+    """
+    try:
+        # Register HEIF opener with Pillow
+        pillow_heif.register_heif_opener()
+        
+        # Open the HEIC file
+        img = Image.open(heic_file)
+        
+        # Create a temporary file for the output PNG
+        with tempfile.NamedTemporaryFile(delete=False, suffix='.png') as tmp:
+            # Save as PNG with maximum compression (lossless)
+            img.save(tmp.name, 'PNG', compress_level=9)
+            return tmp.name
+            
+    except Exception as e:
+        raise gr.Error(f"Error converting HEIC to PNG: {str(e)}")
+
+def process_heic_files(files):
+    """
+    Process one or more HEIC files and return download links for the converted PNGs
+    """
+    if not files:
+        return None
+        
+    output_files = []
+    for file in files:
+        try:
+            png_path = convert_heic_to_png(file.name)
+            output_files.append(png_path)
+        except Exception as e:
+            print(f"Error processing {file.name}: {str(e)}")
+    
+    return output_files if output_files else None
+
+# Create the Gradio interface
+demo = gr.Interface(
+    fn=process_heic_files,
+    inputs=gr.File(
+        file_count="multiple",
+        file_types=[".heic", ".HEIC", ".heif", ".HEIF"],
+        label="Upload HEIC/HEIF Files"
+    ),
+    outputs=gr.Files(label="Download Converted PNGs"),
+    title="HEIC to PNG Converter",
+    description="Upload one or more HEIC/HEIF images to convert them to lossless PNG format.",
+    allow_flagging="never"
+)
+
+if __name__ == "__main__":
+    # Print installation instructions if pillow_heif is not available
+    try:
+        import pillow_heif
+    except ImportError:
+        print("Error: pillow_heif is required but not installed.")
+        print("Please install it using: pip install pillow-heif")
+        exit(1)
+        
+    # Run the Gradio app
+    demo.launch(share=False)

requirements.txt

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+gradio>=3.0.0
+pillow>=9.0.0
+pillow-heif>=0.7.0
+numpy>=1.20.0