Author Topic: Problems with Two Frame Mosaic of Comet Lovejoy  (Read 901 times)

Offline twade

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Problems with Two Frame Mosaic of Comet Lovejoy
« on: 2015 January 24 12:35:29 »
To all,

I'm having great difficulty in creating a seamless mosaic of Comet Lovejoy.  Each frame is a stack of 4 images.  All images were 30 seconds.  The first panel was tracked on the comet while the second panel was tracked on the stars.  I used a Canon 5D2 with a Canon 200mm f/2.0L lens stopped down to f/2.8. The ISO was set to 3200. Each image was calibrated using masters created from 60 biases, 30 darks, and 25 flats.  I have included both the linear calibrated frames and the non-linear calibrated frames.  When combined neither of these come out close to being seamless using StarAlignment with Frame Adaption and GradientMergeMosaic.  In fact, they both come out looking worse.  I really don't understand why these two frames are not similarly "seen" by the software.  They were taken within two minutes of each other (i.e. four frames at 30 seconds each).  These are large files at approximately 121 MB each.  I have converted them to 16-bit integers to save some download time. 

Here's the link to the files. 

https://www.dropbox.com/sh/8htc18g9fgtvhyp/AACSEdxdcIwJay6vkd_aI1kpa?dl=0

The two files with final in them are the stretched panels.  Each separate panel has been named f1 and f2.  If using Overlay in GradientMergeMosaic, you want to set up the module so it overlays frame 2 (i.e. f2) on top of frame 1 (i.e. f1) since frame 2 has a "full" M45.

Thanks for your help,

Wade