from .image_quaternion import (
    rgb_to_quaternion,
    apply_contrast,
    quaternion_to_rgb,
    plot_channels,
    compare_histograms,
    calculate_metrics,
    compare_histograms_by_contrast
)

__all__ = [
    'rgb_to_quaternion',
    'apply_contrast',
    'quaternion_to_rgb',
    'plot_channels',
    'compare_histograms',
    'calculate_metrics',
    'compare_histograms_by_contrast'
]