"""Atari monochrome -- GR.9's 16 luminance shades, exposed as the standard
``mono`` mode for cross-platform parity.  Greyscale by default; ``--mono-base``
tints it to one of the GTIA hues (16 real shades of that hue)."""
from __future__ import annotations

from . import gr9

WIDTH, HEIGHT, PIXEL_ASPECT = gr9.WIDTH, gr9.HEIGHT, gr9.PIXEL_ASPECT


def convert(img_rgb, palette_name="ntsc", dither_mode="floyd",
            intensive=False, base_color=None):
    conv = gr9.convert(img_rgb, palette_name, dither_mode, intensive,
                       base_color=base_color)
    conv.mode = "mono"
    return conv