Codex
40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
from __future__ import annotations
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import numpy as np
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from .chroma import BackgroundModel
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from .settings import DespillSettings
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def despill_green(
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rgb: np.ndarray,
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alpha: np.ndarray,
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bg_confidence: np.ndarray,
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model: BackgroundModel,
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settings: DespillSettings,
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) -> tuple[np.ndarray, np.ndarray]:
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rgb_f = rgb.astype(np.float32) / 255.0
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if not settings.enabled:
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return rgb.copy(), np.zeros(alpha.shape, dtype=np.float32)
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edge = (alpha > settings.edge_low) & (alpha < settings.edge_high)
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r = rgb_f[..., 0]
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g = rgb_f[..., 1]
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b = rgb_f[..., 2]
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neutral_green = np.maximum(r, b) + settings.green_excess_margin
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excess = np.maximum(g - neutral_green, 0.0)
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edge_weight = np.clip((1.0 - np.abs(alpha - 0.5) * 2.0), 0.0, 1.0)
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bg_weight = np.clip(bg_confidence, 0.0, 1.0)
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mask = edge.astype(np.float32) * edge_weight * np.maximum(bg_weight, 0.25)
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out = rgb_f.copy()
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out[..., 1] = g - excess * mask * settings.strength
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# Very light compensation toward the non-green channels to avoid gray fringes.
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bg_green = float(model.rgb_center[1])
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compensation = excess * mask * settings.strength * min(0.25, bg_green * 0.15)
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out[..., 0] = np.clip(out[..., 0] + compensation * 0.5, 0.0, 1.0)
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out[..., 2] = np.clip(out[..., 2] + compensation * 0.5, 0.0, 1.0)
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return np.clip(out * 255.0, 0, 255).astype(np.uint8), mask.astype(np.float32)
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