modify the code to use opencvs lancso 4 for the scaling keep everything else (linear light, ...) the same. Code: import os
from PIL import Image
import numpy as np

def srgb_to_linear(srgb):
    """Convert sRGB values to linear RGB."""
    threshold = 0.04045
    linear = np.where(
        srgb <= threshold,
        srgb / 12.92,
        ((srgb + 0.055) / 1.055) ** 2.4
    )
    return linear

def linear_to_srgb(linear):
    """Convert linear RGB values to sRGB."""
    threshold = 0.0031308
    srgb = np.where(
        linear <= threshold,
        linear * 12.92,
        1.055 * (linear ** (1 / 2.4)) - 0.055
    )
    return srgb

def resize_in_linear_light(img, new_size):
    """
    Resize a PIL image in linear light.
    
    Parameters:
    - img: PIL Image instance.
    - new_size: tuple, the desired size (width, height).
    
    Returns:
    - final_img: PIL Image instance of the resized image.
    """
    # Convert image data to a NumPy array and scale to [0, 1]
    img_np = np.array(img, dtype=np.float32) / 255.0
    
    # Convert from sRGB to linear RGB
    linear_rgb = srgb_to_linear(img_np)
    
    # Convert linear RGB back to an image object for resizing
    # Multiply by 255 to scale back to [0, 255]
    linear_img = Image.fromarray(np.uint8(np.clip(linear_rgb * 255.0, 0, 255)), mode='RGB')
    
    # Resize the image using a high-quality downsampling filter
    resized_linear_img = linear_img.resize(new_size, resample=Image.LANCZOS)
    
    # Convert resized linear RGB image back to NumPy array and scale to [0, 1]
    resized_linear_np = np.array(resized_linear_img, dtype=np.float32) / 255.0
    
    # Convert from linear RGB back to sRGB
    resized_srgb = linear_to_srgb(resized_linear_np)
    
    # Scale to [0, 255] and clip any out-of-range values
    final_img_np = np.uint8(np.clip(resized_srgb * 255.0, 0, 255))
    
    # Create and return the final image
    final_img = Image.fromarray(final_img_np, mode='RGB')
    return final_img

def process_images(input_dir, output_dir, target_height):
    """
    Process all images in input_dir (recursively), downscale them to target_height while maintaining 
    aspect ratio, and save to output_dir, keeping the folder structure.

    Parameters:
    - input_dir: str, path to the input directory.
    - output_dir: str, path to the output directory.
    - target_height: int, the target height for the resized images.
    """
    for root, dirs, files in os.walk(input_dir):
        for filename in files:
            # Check if the file is an image
            if filename.lower().endswith(('.png', '.jpg', '.jpeg', '.bmp', '.tif', '.tiff', '.gif')):
                input_file_path = os.path.join(root, filename)
                # Construct the output file path
                relative_path = os.path.relpath(root, input_dir)
                output_folder = os.path.join(output_dir, relative_path)
                os.makedirs(output_folder, exist_ok=True)
                
                # Change the extension to .png
                name, _ = os.path.splitext(filename)
                output_file_name = name + '.png'
                output_file_path = os.path.join(output_folder, output_file_name)
                
                # Open the image
                try:
                    with Image.open(input_file_path) as img:
                        img = img.convert('RGB')  # Ensure image is in RGB mode
                        
                        # Calculate new size
                        width, height = img.size
                        aspect_ratio = width / height
                        new_height = target_height
                        new_width = int(new_height * aspect_ratio)
                        new_size = (new_width, new_height)
                        
                        # Resize in linear light
                        resized_img = resize_in_linear_light(img, new_size)
                        
                        # Save the image
                        resized_img.save(output_file_path, format='PNG')
                        
                    print(f"Processed image: {input_file_path} -> {output_file_path}")
                except Exception as e:
                    print(f"Failed to process image {input_file_path}: {e}")

if __name__ == '__main__':
    input_directory = r'D:\Bilder\Python\1. Input'
    output_directory = r'D:\Bilder\Python\2. Output'
    target_height = 1600

    process_images(input_directory, output_directory, target_height)