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Make LUTs more realistic

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Andras Schmelczer 2024-06-16 20:50:15 +01:00
parent 70917e26c3
commit 8bc329293b
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2 changed files with 71 additions and 22 deletions
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59
src/colour_lut.ipynb
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34
src/editor/utils/get_colour_lut.py
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@ -4,17 +4,39 @@ from .random import random
from .interpolate import interpolate, INTERPOLATION_TYPE
def get_edit_points(variance: float, count: int) -> List[float]:
def get_random_saturation_per_hue_lut(
variance: float = 0.4, count: int = 12
) -> List[int]:
edit_points = [random(-variance, variance) + 1 for _ in range(count)]
return [
random(i / (count - 1) - variance, i / (count - 1) + variance)
for i in range(count)
interpolate(edit_points, i / 255, type="cubic")
for i in np.linspace(0, 255, 256)
]
def get_colour_lut(
variance=0.1, count=5, type: INTERPOLATION_TYPE = "cubic"
def get_random_brightness_lut(
variance: float = 0.2,
count: int = 6,
type: INTERPOLATION_TYPE = "linear",
min_spectrum_size: float = 0.6,
max_spectrum_size: float = 1.15,
) -> List[int]:
edit_points = get_edit_points(variance=variance, count=count)
spectrum_size = np.random.uniform(min_spectrum_size, max_spectrum_size)
spectrum_start = np.random.uniform(0, max(0, 1 - spectrum_size))
edit_points = sorted(
[
spectrum_start,
*[
spectrum_start
+ i * spectrum_size / (count - 2)
+ np.random.uniform(-variance, variance)
for i in range(1, count - 2)
],
spectrum_start + spectrum_size,
]
)
return [
round(interpolate(edit_points, i / 255, type=type) * 255)
for i in np.linspace(0, 255, 256)