406cc7c0c7
Add S-expression based video effects pipeline with modular effect definitions, constructs, and recipe files. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
60 lines
1.5 KiB
Python
60 lines
1.5 KiB
Python
# /// script
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# requires-python = ">=3.10"
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# dependencies = ["numpy", "opencv-python"]
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# ///
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"""
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@effect hue_shift
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@version 1.0.0
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@author artdag
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@description
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Rotates the hue of all colors by a specified amount (0-360 degrees).
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Creates rainbow cycling effects when animated over time.
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@param shift float
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@range 0 360
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@default 0
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Hue rotation in degrees. 0/360 = unchanged, 180 = complementary colors.
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@example
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(effect hue_shift :shift 180) ; complementary colors
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@example
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;; Rainbow cycling based on time (use with frame counter in state)
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(effect hue_shift :shift (bind beat_position :range [0 360]))
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"""
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import numpy as np
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import cv2
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def process_frame(frame: np.ndarray, params: dict, state: dict) -> tuple:
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"""
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Shift hue of a video frame.
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Args:
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frame: Input frame as numpy array (H, W, 3) RGB uint8
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params: Effect parameters
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- shift: hue rotation in degrees (default 0)
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state: Persistent state dict (unused)
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Returns:
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Tuple of (processed_frame, new_state)
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"""
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shift = params.get("shift", 0)
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if shift == 0:
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return frame, state
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# Convert RGB to HSV (OpenCV uses H: 0-179, S: 0-255, V: 0-255)
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hsv = cv2.cvtColor(frame, cv2.COLOR_RGB2HSV)
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# Shift hue (OpenCV hue is 0-179, so divide by 2)
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hue_shift = int((shift % 360) / 2)
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hsv[:, :, 0] = (hsv[:, :, 0].astype(np.int16) + hue_shift) % 180
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# Convert back to RGB
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result = cv2.cvtColor(hsv, cv2.COLOR_HSV2RGB)
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return result, state
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