2022-05-29: APP 2.0.0-beta2 has been released !
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remove light pollution problem
Beginner's problem. I use the workflow in Christian Sasse's tutorial. I have successfully produced several really good images so far. I recently imaged M51 (lrgb). All of the blue frames were bad - the rest were quite good. I went ahead and made a really nice image from the data I had. The next night, I reshot the blue frames with excellent results. I then loaded the good lrg images and the new good b images. I combined rgb and had a really nice image. When I started "remove light pollution", the image went completely white. I have read about others having this problem. I tried adjusting the b, w, and st sliders. I was able to see my image, but I couldn't get it even close to what it looked like before starting light pollution removal. Any pointers would be greatly appreciated. And thanks to the developers of this software - I'm thrilled that I'm finally producing images after having no success with other programs!
Mmm, you calibrated all frames with the correct calibration files? It might be that dark or bias calibration is the issue in that case. Not sure, for that I would need to check myself with the original raw data and raw calibration files. If you want to upload a set (good versus the white version) I can give you the link.
That would be great if you could take a look. The only calibration frames I used were 15 darks.
Those may have an issue, could you just try without them to see if it happens again?
I have another problem which is probably related. Took data on M82 last night. The good news is that only 2 out of 160 frames were not registered. However, when I combine LRGB there is a problem. If I remove the luminance channel, the image is normal. When I add in the luminance channel, it's messed up. I'll attach screens shots of both.
Indeed that did the trick. What do you suppose is wrong with the darks? I took them in between another imaging run and this one, with the same gain and exposure time.
Difficult to say, I just notice that when something is up with calibration, it usually are the darks. Could be a number of things, what settings do you use when making the dark and what do you do in APP itself?
Mmmm, maybe they weren't completely dark? Is the offset ok as well on them?
@vincent-mod Lens cap on camera, camera inside thick black glove (outside at night). I'm ashamed to say I do not know what offset is. I will learn about that tonight. Now I have to go to work. Thank you for taking the time to help.
An offsets is a noise floor basically for the sensor (if I'm not saying this incorrectly 🙂 ). But those are for astro-camera's.
In your case, I probably would need to look at the dark itself. Light can still create an issue, might also come from within the camera even. No idea if that's the case for you of course. No light in the garden at night from neighbours?