What's causing these "waves"?

[matt_baker]

I've been processing someone's data but I noticed that whenever I tried to do any kind of DBE, I would always get these wave like structures and can't get rid of them.

Does anyone know what's up here?

Edited April 20, 2020 by matt_baker

[vlaiv]

I have no idea but suspect low bit count of data.

Did you by any chance take PNG file that was posted online and is only 8 bit per pixel? That could explain artifact.

Maybe convert it to 32bit float prior to DBE?

[matt_baker]

2 minutes ago, vlaiv said:

I have no idea but suspect low bit count of data.

Did you by any chance take PNG file that was posted online and is only 8 bit per pixel? That could explain artifact.

Maybe convert it to 32bit float prior to DBE?

It's a 16 bit fits file

[wimvb]

The image may be so strongly underexposed, that the background shows discrete levels. You can try dbe with "normalize" checked in the image correction settings. Then stretch gently with midpoint in histogram not too far to the left.

[matt_baker]

I figured out the issue. Apparently it didn't like being in 16 bit so I set it to 32 bit and it just worked. vlaiv was right

Edited April 21, 2020 by matt_baker

[matt_baker]

Here's the processed version, still some funky stars but they appeared in the raw stacked image so I'm not sure