Cygnus 36 Piece Mosaic Preview

Started 1 week ago | Discussions thread
OP sharkmelley Senior Member • Posts: 2,068
Re: Cygnus 36 Piece Mosaic Preview

weihaowang wrote:

Excellent mosaic, Mark.

Do you consider to do image calibration and stacking also in APP? I vaguely remember that it recently starts to support Sony files. (I could be wrong though.) Mabula once told me that stacking in PI can slightly alter the image distortion and make subsequent mosaicking mode challenging in APP.


I believe it now supports Sony files but it didn't previously so I haven't used it for stacking.  Also I don't see how stacking in PI introduces image distortion because we choose a reference frame and PI aligns all other frames onto that reference frame.

I found by trial and error that for a mosaic with a large number of pieces it makes a lot of difference to perform a background subtraction so the panes more or less match before loading them into APP because then there is less work for APP to do in adjusting levels and blending.  I've seen the same recommendation made on the APP forum.


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