The completed M101 image after processing in PixInsight and Photoshop.
The steps used were:
- Screen stretch to examine data and look for issues (linear)
- Calibration (bias + flat-field)
- Defect removal (bad column)
- Stacking (median combine)
- Curves (Photoshop)
- Sharpening of galaxy core only (Photoshop, Unsharp mask)
The raw data was a set of three 180-second images obtained with the one-meter telescope.