[AZ-Observing] Re: Terminator Mosaic
- From: Tom Polakis <tpolakis@xxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 28 Aug 2012 21:11:10 -0400
Moon mosaics are quite easy to create, which is why I am doing them.
Take the images such that there's about 25% overlap between them. Since this
is extreme telephoto photography, there's really not much distortion at the
corners to worry about. The lighting is constantly changing, so it's best to
move in one direction along the terminator. Make sure that each of the frames
that you are going to assemble have been created the same way, including
processing for brightness and sharpening.
For registering frames, I use Photoshop, and do it the old fashioned, manual
way. After laying down the second frame, change its opacity to something like
50%. Now zoom way in on some craters, and line them up with the arrow keys.
Turn the opacity back up to 100%, and viola, no seams! Work your way up the
terminator with successive frames.
Wayne Johnson pointed out a flaw in the previously posted mosaic that eluded
me. It was certainly caused by inadvertently moving a layer that was off the
screen at the time, so don't do that. The corrected mosaic is here:
http://www.pbase.com/polakis/image/145692898
Tom
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