Author Topic: PI Processing - What Are These Dark Spots?  (Read 145 times)

Offline jwaters125

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PI Processing - What Are These Dark Spots?
« on: 2019 February 21 21:08:35 »
See the picture below.  What's causing these dark pixels?  Are my Sigma High / Low values set wrong?  These dark pixels are all over the place.

Ha Modified Canon 6D
Canon 200mm f/2.8L II lens
BackyardEOS

52 Lights (80 Sec), 60 Darks (80 Sec), 60 BIAS and 40 Flats

I did the Darks in two batches.  The first 20 Darks I did right after I did my Lights.  I added the second batch of 40 Darks today and reprocessed.  I used my refrigerator for the second set of Darks.  I thought the two sets of Darks were within 3 to 5F degrees max.  It turns out they were 8 to 10F degrees apart.

Steps so far:
- BatchPreprocessing
- ImageIntegration
- DynamicCrop
- DynamicBackgroundExtraction
- MultiscaleMedianTransform

More info here
https://www.cloudynights.com/topic/651534-dslr-pixinsight-processing-what-are-these-dark-spots/#entry9164991

Could the Dark temperature differences cause this problem?

Offline pfile

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Re: PI Processing - What Are These Dark Spots?
« Reply #1 on: 2019 February 21 21:30:48 »
did you have dark optimization turned on during calibration?

that can sometimes cause hot pixels to be overcorrected and leave you with these black pixels.

rob

Offline jwaters125

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Re: PI Processing - What Are These Dark Spots?
« Reply #2 on: 2019 February 21 22:19:12 »
Yes