[kurwin]

請問Noise Reduction是否於光線不足之下可以減少出現一些類似一粒粒
o既野出玩係照片之上?
其實Noise Reduction 是什麼~
多謝解答~
小弟不勝感激~

[hkhei]

一般講o既noise reduction 係用o係長時間曝光o個陣用remove hot pixel的..
一般o既做法係佢正常影一張相，再關左快門影一張同樣曝光時間o既
之後將兩張相相減....

暗位o既noise都可以用software，例如neatimage，黎處理
效果唔錯，不過sharpness就會減低

[kurwin]

Thx~hkhei
不過仲係唔係好明呀~
可唔可以解釋詳盡D呀
咁一般Noise Reduction個function係咩環境下用架?

[hkhei]

一般noise reduction 佢會o係長時間曝光自己開(如有)
或者你可以睇下呢度
http://www.dpreview.com/learn/Glossary/Digital_Imaging/Noise_Reduction_01.htm

[kurwin]

Thanks for your help~
hkhei

[subzeroice]

The Noise normally cause by the part of CMOS, charge-coupled device (CCD), thermal...etc. Once when the Camera is warm up. the CCD have more trouble capturing the image. Another reason like lower shutter speeds and higher, light-sensitive ISO settings can also cause the problem.

The noise Reduction taking a photo with the shutter closed just before the shot is made. This "dark reading" will tell the camera which "pixel" on the CCD are malfunctioning so that they can be subtracted from the shot.

Using Noise Reduction can actually reduce the "noise" on the pic, but the picture need more time to take, normally twice than a normal photo and longer time to save on the memory card.