[matthew_c]

之前睇過C hing 嘅post, 影夜景要做到低noise其中一個辦法就是後製時曡加相片.
但是我發現原來曡加相片都會使相片岀現很多noise.
我第一張相的拍攝資訊如下: f18 13" ISO100
請各位指教為何曡加相片後noise 仍多的問題.
THX!

[tam_dominic]

你是曡加相同 一張 相片
還是
曡加 幾張 相同場景相片 ?

One must first load all images into Photoshop which are to be averaged, and then copy and past each image on top of each other so that they are all within the same project window. Once this is done, the averaging can begin.

The key to averaging in Photoshop is to remember that each layer's opacity determines how much the layer behind it is "let through," and the same goes for each image underneath.

This means that to properly average four images, for example, one should not set each layer's opacity to 25%. One should instead set the bottom (or background) layer's opacity to 100%, the layer on top of that to 50%, and then the next layer to 33%, and finally the top layer to 25%.

Good luck
and
Happy shooting !

[亞典波羅]

樓主, 影夜景無必要用 f18 啦, f8-f14 屋經好好, 過長的曝光先間好容易有 noise.

影得好, 色溫及曝光皆準, 推少少色, noise 就會唔會有了.

個人認為, 你先注重拍攝, 影得好, 唔駛 photoshop 一樣掂, 要改都係好少好少.

不過用 photoshop 的確會令張相唔同晒.

[ronsonhbo]

同意亞典波羅的建議，現代CMOS感應器的感光度，非常理想。不能夠將傳統菲林相機概念應用在數碼相機。一般設定在光圈 f8-11影夜景已經非常理想，過細的光圈反會會造成過多noise.
如果使用FF CMOS感應器或者比較高級的機種，維持適當光圈數值可以發揮鏡頭的最佳效果。:)

[matsu]

有時最好-1ev至-2ev可防止天灰