import sys
from PIL import Image

def remove_white_bg(input_path, output_path, threshold=235):
    img = Image.open(input_path).convert("RGBA")
    data = img.getdata()
    new_data = []
    
    for item in data:
        r, g, b, a = item
        avg = (r + g + b) / 3.0
        
        # If it's very close to white, make it transparent
        if avg > threshold and min(r,g,b) > threshold - 10:
            # Feathering the alpha channel
            # 255 = fully transparent
            # threshold = fully opaque
            factor = (avg - threshold) / (255 - threshold)
            alpha = int(255 * (1 - factor))
            
            # Clamp alpha
            alpha = max(0, min(255, alpha))
            
            # We keep the pixel white to avoid dark fringes, but lower its opacity
            new_data.append((255, 255, 255, alpha))
        else:
            new_data.append(item)
            
    img.putdata(new_data)
    
    # Optional: crop the image to its bounding box
    bbox = img.getbbox()
    if bbox:
        img = img.crop(bbox)
        
    img.save(output_path, "PNG")

if __name__ == "__main__":
    remove_white_bg(sys.argv[1], sys.argv[2])