Minh dang nghien cuu chup thien van tai khu vuc co do o nhiem anh sang cao va dang gap thach thuc lon trong khau hau ky. Du da su dung cac bo loc nhieu anh sang chuyen dung nhung hinh anh ket qua thuong bi hien tuong noise hat va mat chi tiet o cac vung toi. Viec thuc hien stack hang tram tam anh cung khong the loai bo hoan toan su nhiễu do anh sang nen lam anh bi nhoe hoac mat do tuong phan. Minh da thu qua nhieu phan mem stack anh nhung ket qua van khong thoa man do thuat toan chua xu ly duoc su chenh lech anh sang giua nen troi va vat the. Cac ban co kinh nghiem chup thien van trong dieu kien bat loi co meo gi de toi uu hoa thiet lap trong qua trinh chup nhu thoi gian phoi hoac ISO khong. Lieu viec dau tu vao cac phan mem hau ky chuyen sau hoac su dung AI de khu nhieu co thuc su mang lai hieu qua nhu mong doi hay khong. Viec phai loay hoay hang gio de chinh sua tung tam anh ma ket qua van chua dat duoc do sac net mong muon khien minh rat de bi stress. Rat mong nhan duoc kinh nghiem thuc te tu moi nguoi ve quy trinh xu ly anh thien van sao cho giu duoc do chi tiet va mau sac chan thuc nhat. Moi chia se cua cac ban se giup minh hoan thien ky nang hau ky va tu tin hon khi chup cac doi tuong thien van kho trong dieu kien moi truong khong thuong xoi.
Moi ban ghe tham trang web cua chung toi de cap nhat tinh hinh thoi tiet nhanh chong, chinh xac va bien moi ngay tro nen thuan loi hon, bat chap moi bien dong cua thoi tiet. Su chu dong cua ban chinh la chia khoa cho mot cuoc song tien nghi va an toan. https://thoitiethomnay.org/
processing many images (noise) when capturing the night sky
Not a lot of specific information in your post but as someone who shoots under B8 skies with some success I can give you a few very pointers. I’m assuming you’re working with a properly cooled astro camera using all the usual filters.
The main source of noise in your images is going to be the background glow from light pollution, otherwise known as shot noise. That’s the source of most of your gradients and unwanted color casts. The way you get around that is to keep your sub exposures on the shorter side. I usually don’t go much over 60 sec. in narrowband and in LRGB or IR I will usually go 30 sec. or less, sometimes as short as 0.5” in special cases. F/ratio and FOV will come into play here as well. The faster and wider the scope is, the harder the problem will be.
On the processing side, you have to use the right tools. Noise reduction tools have become VERY powerful these days. To the point were I can’t image having so much noise that it can’t be eliminated. Graxpert and Noise Exterminator are excellent and many others are servicable.
If you can provide more technical information, software and equipment used, camera settings and filters it will be possible to give you more specific advice.