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Old 04-08-2012, 02:52 PM
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RickS (Rick)
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RickS is offline
Join Date: Apr 2010
Location: Brisbane
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Originally Posted by whzzz28 View Post
Your using PI to stack correct (post processing)?
Pete is having the problem with unstacked raw subs. Looks like Maxim with the "Save Data in Unsigned Format" option enabled writes the data in unsigned 16-bit but doesn't set BZERO in the FITS header as other applications would expect (the Maxim help file vaguely alludes to this).

PI thinks the data is 16-bit signed and so the values in the brighter areas of the image (with the most significant bit set) look like negative numbers and hence stars have dark cores.

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