[tsangkawing]

我對以下的情況有一些的疑問，希望各位解難！

假設有A同B兩部數碼相機，A可以拍攝６００萬像素，而B可以拍攝１０００萬像素，兩者的CCD都是1/1.8，其他因素不變。

如果A拍一張６００萬像素的照片，而B也選擇拍一張６００萬像素的照片，咁邊張質素會好D，或者是一樣？

[peterchan04]

要 a .... 吾要 b.

[Tai Man Lam]

理論上Ａ會好過Ｂ

[老叟]

梗係大好過細啦

[Philippe]

B實際上係唔識拍600萬像素的.都係拍左1000萬像素再用機內軟件resize翻做600萬像素.你所見到的Jpeg相係相機影完raw再轉出來的,如果單影raw係一定要影最大像素的.

[Sygate]

咁你又要假設佢地的 sensor 程制係一樣先

[cwk_patrick]

Photo taken by 'A' should be better than 'B' as pixel size of 'A' is larger than 'B' (i.e. pixel more crowed in 'B').

[kingkonghk]

影全版報紙, 2000萬都唔得喎, 有次朋友話想影張a1海報, 用來印刷, 海報下邊有1行細字, 結果就用左大底slide來影, 數碼機背搞唔掂

[kingkonghk]

係喎~~ 下次有藉口

[photog]

經過即時測試，証明2000萬像素拍攝報紙的字清楚可見，800萬像素的DSLR一樣可以。測試圖在攝影世界討論區內
http://www.photocafe.hk.ro/topic.cgi?forum=63&topic=2&start=0#2

[Tai Man Lam]

我試過用ＳＯＮＹ　ＤＳＣ　ＲＩ影報紙同雜誌（亞洲周刊），報紙全版影出字大細，放到100％睇都唔係幾得，雜誌就十分清晰，隻隻字都大大粒，效果好過開Scanner+除網。

[kingkonghk]

photog, 用來印刷要350dip, 出mon清要72dip, 就算偷雞都要250dpi, 1張a1有33"x23", 偷雞250dip出左都要 8250*5750先可以點對點, 要4700萬機先頂得住, 莫講話要300dip點對點, 2200萬只可出到180dip左右

[hktsoi]

kingkonghk,

首先要更正是dpi dot per inch而不是dip。其次是問為甚麼印刷要用350dpi?要討論前要攪清楚你是真的明白是那一回事，那樣討論才有意思。

[cwk_patrick]

To: d2c

Your points are right.

But 'tsangkawing' ask if both 'A' & 'B' using same resolution to take photo. It's hard to believe 8M --> 5M (internal DC's resize) must have better 'outlook' than one originally 5M.

Noise will be more noticeable either in shadow area in day or night.

open to discuss

[cwk_patrick]

To: Tai Man Lam

I guess the reason is newspaper's resolution (dpi) is lower than magazine.

Try using copies (200%) to copy both newspaper and magazine and you may know my point.