45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
"""CoCo 3 GIME monochrome: 640x192, 2 colours (black + white) -- the highest-
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resolution CoCo 3 mode, tone carried by dithering. ``--mono-base`` tints the
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second tone."""
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from __future__ import annotations
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import numpy as np
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from ... import dither, palette as c64pal
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from ...convert.base import Conversion, perceptual_error
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from .. import palette as g
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from . import _common
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WIDTH, HEIGHT = 640, 192
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PIXEL_ASPECT = 0.5
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CRES = 0
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def convert(img_rgb, palette_name="gime", dither_mode="floyd",
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intensive=False, base_color=None):
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plab = g.palette_lab()
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black = min(g.GREYS, key=lambda i: plab[i, 0])
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if base_color in range(64) and base_color != black:
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ramp = sorted({black, int(base_color)}, key=lambda i: plab[i, 0])
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else:
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ramp = sorted(g.GREYS, key=lambda i: plab[i, 0])
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ramp = [ramp[0], ramp[-1]] # black + white
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img_lab = c64pal.srgb_to_lab(img_rgb)
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mono_lab = np.zeros_like(img_lab); mono_lab[..., 0] = img_lab[..., 0]
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plab_mono = np.zeros_like(plab); plab_mono[:, 0] = plab[:, 0]
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allowed = np.tile(np.array(ramp), (*mono_lab.shape[:2], 1))
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idx = dither.quantize(mono_lab, allowed, plab_mono, dither_mode).astype(np.int64)
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lut = {p: k for k, p in enumerate(ramp)}
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pen = np.vectorize(lut.get)(idx).astype(np.uint8)
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screen = _common.PACK[CRES](pen)
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prgb = g.get_palette().astype(np.uint8)
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return Conversion(
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mode="mono", width=WIDTH, height=HEIGHT, pixel_aspect=PIXEL_ASPECT,
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index_image=idx.astype(np.uint16), data=screen, data_addr=0x4000,
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viewer="coco3", preview_rgb=prgb[idx.astype(np.uint16)],
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error=perceptual_error(idx, mono_lab, plab_mono),
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meta={"palette": "gime", "dither": dither_mode, "cres": CRES,
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"inks": ramp, "border": ramp[0]},
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)
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