仙女座大星系, M31

C.L.Chan

仙女座大星系, M31.
前天貼了一張 M31, 同好 HC Ng話似黑白相片 , 有同好叫我推高飽和度 , 但只出紅色. 同好APO教我用 Photoshop推 RGB曲線, 但我無 . 改用免費軟件 GIMP來推 , 效果好嗎?
M31 Andromeda Galaxy 2018 08 11 HKT 23:30 to 23:42, Canon 700D Camera, IR filter removed. Canon EF 55-200 set at 200 mm, ISO 6400, Exposure 90 sec. each. Use Deep Sky Stacker software to stack 15 light frames, 10 Dark frames 7 10 Bias frames. Total exposure is 22.5 minutes. Blue colour enhanced by GIMP. Place where the photos taken is at台灣大雪山