Recommended Settings for Combining Flats
NOTE: Flats must be dark subtracted. If they have been normalized in a different program then you can uncheck the Normalization option.
Combine Method | Standard Deviation Masking |
Pixel Arithmetic | Mean |
Smoothing | Uncheck all |
Normalization | Check on and try 60%. |
Ignoore Block Border | Uncheck |
Sigma Value | 0.5 to start - Shoot for about 98% usage of each image in the results dialog |