Troubleshooting
Reduce Noise in Planetary Images
Fix grainy, noisy planetary photos. Learn how stacking reduces noise and which settings give the cleanest results.
Quick Solution
Use Sigma-Clip Stacking stacking algorithm for the best results.
Statistical outlier rejection - for scientific-quality results
Common Causes
- 1High camera gain amplifies sensor noise
- 2Short exposures have less signal
- 3Hot pixels and sensor artifacts
- 4Compression artifacts in smartphone video
How to Fix It
1
Stack more frames (noise reduces by square root of n)
2
Use median or sigma-clip to remove outliers
3
Enable wavelet denoising in post-processing
4
Lower camera gain and increase exposure slightly
Settings to Adjust
Stack PercentageDenoise AmountHot Pixel Removal
These settings in Uranum's Advanced Mode can help resolve this issue.
Prevention Tips
- -Balance gain and exposure for optimal SNR
- -Use dark frames if your camera supports them
- -Avoid maximum gain settings
Why Sigma-Clip Stacking?
Sigma-Clip Stacking
IntermediateStatistical outlier rejection - for scientific-quality results
How it works:
- 1.Calculates mean and standard deviation for each pixel across all frames
- 2.Values beyond 2.5 sigma (standard deviations) are flagged as outliers
- 3.Iterates 3 times to catch outliers that skewed initial statistics
Best for:
- -Removing cosmic ray hits that appear as bright dots
- -Cleaning hot pixels and column defects from uncooled sensors
- -Videos contaminated with multiple satellite trails
Try with Your Planet: Sigma-Clip Stacking
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