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Revert the addition of perpendicular angles and lower attenuation_factor

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It was a mistake to add the perpendicular angles in the previous commit: I had the rainbow effect removal process called 2 times when I did this, for testing purposes (One before downscale and one after downscale).

The proper way to call the process is only after the downscale. And in this case it is not necessary to remove frequencies along the perpendicular angles.

In the mean time, attenuation_factor=0.15 has proven to work well along a collection of testing images.

It should be my latest commit for this feature
This commit is contained in:
Its-my-right
2025-07-13 16:09:32 +02:00
committed by Alex Xu
parent 2da5b11858
commit 0d967084a0
1 changed files with 3 additions and 7 deletions
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10
kindlecomicconverter/rainbow_artifacts_eraser.py
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@@ -14,8 +14,8 @@ def fourier_transform_image(img):
return fft_result return fft_result
def attenuate_diagonal_frequencies(fft_spectrum, freq_threshold=0.3, target_angle=135, def attenuate_diagonal_frequencies(fft_spectrum, freq_threshold=0.30, target_angle=135,
angle_tolerance=10, attenuation_factor=0.25): angle_tolerance=10, attenuation_factor=0.15):
""" """
Attenuates specific frequencies in the Fourier domain (optimized version for rfft2). Attenuates specific frequencies in the Fourier domain (optimized version for rfft2).
@@ -64,15 +64,11 @@ def attenuate_diagonal_frequencies(fft_spectrum, freq_threshold=0.3, target_angl
# Calculation of complementary angle # Calculation of complementary angle
target_angle_2 = (target_angle + 180) % 360 target_angle_2 = (target_angle + 180) % 360
# Calulation of perpendicular angles (for better final rendering)
target_angle_3 = (target_angle + 90) % 360
target_angle_4 = (target_angle_3 + 180) % 360
# Create angular conditions in a vectorized way # Create angular conditions in a vectorized way
angle_condition = np.zeros_like(angles_deg, dtype=bool) angle_condition = np.zeros_like(angles_deg, dtype=bool)
# Process both angles simultaneously # Process both angles simultaneously
for angle in [target_angle, target_angle_2, target_angle_3, target_angle_4]: for angle in [target_angle, target_angle_2]:
min_angle = (angle - angle_tolerance) % 360 min_angle = (angle - angle_tolerance) % 360
max_angle = (angle + angle_tolerance) % 360 max_angle = (angle + angle_tolerance) % 360