GradientCorrection works remarkably well with default parameters for most images. Here is a collection of moderately difficult cases where the process does not require adjusting any parameters to yield a good gradient correction. Sometimes, we change one or two parameters just to show you how to achieve even better results.
00:30 Messier 31
01:25 Rho Ophiuchi
01:45 Messier 51
02:28 Messier 8 / Messier 20
03:07 NGC 6946 / Barnard 150
04:04 NGC 1333
05:08 NGC 7000
