fix for pyramid.py

[ALAINRAAD]

you should fix the "create_laplacian_image_pyramid" in the pyramid.py .
it should be like this

def create_laplacian_image_pyramid(image, pyramid_levels):
    gauss_pyramid = []
    laplacian_pyramid = []

    gauss_pyramid.append(image)  # Start with the original image
    for i in range(pyramid_levels):
        down_image = cv2.pyrDown(gauss_pyramid[i])
        gauss_pyramid.append(down_image)

    for i in range(pyramid_levels):
        # Convert to 3 channels before subtraction (KEY CHANGE)
        current_level = gauss_pyramid[i]
        if current_level.ndim == 3 and current_level.shape[2] == 4: #Check if it has 4 channels
            current_level = current_level[:,:,:3] #Slice to 3 channels

        if i < pyramid_levels - 1: #Only upsample if it's not the last level
            higher_level_upsampled = cv2.pyrUp(gauss_pyramid[i + 1])
            if higher_level_upsampled.ndim == 3 and higher_level_upsampled.shape[2] == 4: #Check if it has 4 channels
                higher_level_upsampled = higher_level_upsampled[:,:,:3] #Slice to 3 channels

            laplacian_pyramid.append((current_level - higher_level_upsampled) + 0)  # Add 0 for type consistency.
        else:
            laplacian_pyramid.append(current_level)  # The last level is just the last Gaussian level.

    return laplacian_pyramid