Image blown out after DBE

Padraig Farrell

Hi,
I having a issue with screen transfer function after doing dynamic background extraction.
when i load the image first in its usually green tint , i apply a un-linked STF,
things are looking promising,
I then carefully apply a DBE and looking at the background model, it seems correct.
Then I apply another un-linked STF but the image seems to me blown out ?
I appreciate any suggestions.

BlockHead

Hi Padraig,

There are a couple of issues here.

1. In terms of the "blowing out" ... this is just a natural consequence of that fact you have removed the background and a recalculated STF will have higher contrast.

2. The second issue is the dark ringing around the galaxy as per your DBE application.

All of the videos below will likely be helpful to you:

(for a nice background DBE solution)

https://www.adamblockstudios.com/articles/dbe-you-are-control-not-the-other-way-around (controlling DBE)

The contrast issue:

https://www.adamblockstudios.com/articles/hidden-issues-common-dbe-misattribution

Please let me know if these answer your question.

-the Blockhead

Padraig Farrell

This totally answered the question and more importantly explained the why part....

I've also been posting on Pixinsight forum to share your insight.

Thank you very much,  I really appreciate it,

https://pixinsight.com/forum/index.php?threads/stf-blows-out-image-after-dbe.20773/

Best regards,

Padraig

Padraig Farrell

So Far