ea40a555956467d98c7d321633a73cf408d9a805,skimage/color/colorlabel.py,,_match_label_with_color,#Any#Any#Any#Any#,42

Before Change

        bg_color = (0, 0, 0)
    bg_color = _rgb_vector([bg_color])

    unique_labels = list(set(label.flat))
    // Ensure that the background label is in front to match call to `chain`.
    if bg_label in unique_labels:
        unique_labels.remove(bg_label)
    unique_labels.insert(0, bg_label)

After Change

    bg_color = _rgb_vector([bg_color])

    // map labels to their ranks among all labels from small to large
    unique_labels, mapped_labels = np.unique(label, return_inverse=True)
    
    // get rank of bg_label
    bg_label_rank_list = mapped_labels[label.flat == bg_label]

Instances