I recently upgraded to GraXpert from v.1.06 (Dione) to v.2.02 which has added an AI interpolation method. The other three methods are Kriging, RBF and Splines. By coincidence I had recently imaged NGC7293 which rides only 25 degrees above my light polluted southern horizon. The result is an intense gradient including an imbedded "donut" that is not removed by darks and flats (calibration). All five GraXpert methods were applied. Of the five, to my eye, Kriging performed the best in reducing the gradient and reducing (but not eliminating) the donut residue. The five images just after applying GraXpert and Paintshop Pro histogram stretch appear below.
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| AI 1.01 |
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| AI 1.00 |
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| Kriging |
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| RBF |
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| Splines |
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