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Recommended update
Update: A number of issues associated with increased complexity in the previous two versions are resolved.
Asterism_0.0.5.3 is tested current and stable. Upgrade to the latest version is recommended, as it includes a number of improvements;
Flat auto correction - this is proving very robust. The default setting of 5 appears to be ideal. The old manual flat illumination correction is retained, for the time being.
Defect map - the process seems to work very well, with no issues observed - use a ‘Noise - radius’ of 7 and a ‘Noise - amount’ of 0.1. It may be necessary to alter settings for different cameras, although, tested on 3 Canon model RAW data and Nikon, I see no variation, except clean flat division.
Linear noise reduction - this is the noise reduction routine used by Defect map, applied to the stacked linear image.
While Asterism is designed to reduce noise in a number of ways, I have found linear noise reduction very effective. The ‘Noise - amount’ value should not be too high - 0.1
Correctly applied, the stacked image processed in StarTools, with Tracking ‘off’, the default noise reduction is adequate.
A ‘Noise - radius’ size, 0 (off) to 30 is available, with sensible radii between 5 - 15; and ‘Noise - amount’ 0.1. Increase the radius for noisy images.
The User Manual requires an update, however, the differences are noted in the version available for download.
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