PixInsight Forum (historical)

PixInsight => General => Topic started by: peterbrack on 2018 June 28 18:34:45

Title: Is this Superbias frame result expected
Post by: peterbrack on 2018 June 28 18:34:45

I have taken 211 bias frames. Used ImageIntegration with the recommended settings:

Average
No Normalization
Don't Care Weights
Deselect Evaluate Noise
Linear Fit Clipping
No Normalization
Clip Low and High Pixels

The image shows the integrated bias frame on the left, and the super bias frame on the right with settings:
Columns
Multiscale Layers 6 ( have tried 5 but similar result)
Median Transform
Exclude large scale structures.

I have done this before a few times and always get a similar result, which is super bias frame which looks like paint dripping down a page held vertically. Is this normal? Certainly doesn't look like the super bias frames created in the literature I have seen.

Also here are links to the bias and super bias images:

Bias :
https://www.dropbox.com/s/evj74xyj9keb5k4/Bias_C211_20180609.xisf?dl=0

Superbias:
https://www.dropbox.com/s/chm9no6kopzqc6g/Superbias_20180609.xisf?dl=0

Peter

Title: Re: Is this Superbias frame result expected
Post by: msmythers on 2018 June 28 22:37:55

Peter

You need to turn on the 24-bit Lookup Tables, the icon with the 24.



Mike

Title: Re: Is this Superbias frame result expected
Post by: peterbrack on 2018 June 28 23:56:35

Hi Mike

Thanks for your reply.

Am unsure what you mean or where exactly to look for this 24

Peter

Title: Re: Is this Superbias frame result expected
Post by: peterbrack on 2018 June 29 00:17:07

Aah just found it Mike in the menu Image-Screen Transfer functions.

That looks a lot better!

Thanks

Peter