Hi, I was stretching an image of the bodes galaxy that I took with my Luminance filter and saw these bands in the image. Does anyone know what these could be? (I'm not talking about the IFN to clarify) 
What is causing these weird banding patterns in my luminance image?
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What have you used to remove the stars?
andrea tasselli:
What have you used to remove the stars?
I used StarXTerminator to make the bands more visible but the bands were visible even in my image with stars. Here is an example:
So, how does the unprocessed stacked master light look like? Just use the auto-stretch.
Your gradient removal process could have gone wrong, so its hard to say.
I say that because you have this unnaturally dark region around bright areas of the image, which is indicative of poor gradient correction.
I say that because you have this unnaturally dark region around bright areas of the image, which is indicative of poor gradient correction.
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andrea tasselli:
So, how does the unprocessed stacked master light look like? Just use the auto-stretch.
Oskari Nikkinen:
Your gradient removal process could have gone wrong, so its hard to say.
I say that because you have this unnaturally dark region around bright areas of the image, which is indicative of poor gradient correction.
That could be a possibility.
That last image proves for me that it's a problem with background extraction. The first image is also over- stretched which is making the BX problem look worse.
It's the BG extraction/correction that is the issue. I did it on the preview and nothing like those bands occur (ignore the vertical iso-line, they are an artifact due to the 8-bit pic).
i would say you have to try to crop your image a bit more it could helping. most cases if gradient removal goes wrong is because of some stacking pattern on the outer frame. try to crop from all side and do it again with graxpert or what ever you are using
andrea tasselli:
It's the BG extraction/correction that is the issue. I did it on the preview and nothing like those bands occur (ignore the vertical iso-line, they are an artifact due to the 8-bit pic).
I guess I just got to get better a doing a Dynamic background extraction what setting did you use for that image?
andrea tasselli:
It's the BG extraction/correction that is the issue. I did it on the preview and nothing like those bands occur (ignore the vertical iso-line, they are an artifact due to the 8-bit pic).
I guess I just got to get better a doing a Dynamic background extraction what setting did you use for that image?
I want to say for the record that I restacked my data this time changing kappa sigma clipping to average and it got rid of the issue.