Comparison of Dark Frame Calibration

Using ImagesPlus

All 3 pics are from the same stack,  July 21, 06  ZS110  21x4min ISO1600 Canon 10d at about 62 deg. F

and were identically processed except for the Dark Frame Calibration. The dark frame used for

calibration was made from 10 frames combined with Sigma Clipped Average.

(Click on text or Image for a larger version)

Simple Dark Frame Calibration

Adaptive Dark Frame Calibration 400-5x5

Adaptive Dark Frame Calibration  800-9x9

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