Suggestion: per channel registration

[lfourquaux]

Another "it would be nice": do registration for each of the RGB channels (for color images) separately, to correct atmospheric dispersion when an ADC is not used.
See https://www.cloudynights.com/topic/509819-adc-demonstration-with-saturn/ for some images.

[lfourquaux]

Note: it could be an option, since it's not always useful and requires more processing time.