[Son]

我想問問，如果要曬3R時，要將相的size變為3.5"X5"
用1600X1200解像時，
相片的size應變為用300dpi的1500X1050
還是320dpi的1600X1120好？？
因為我見有人會教人改成1500X1050, 又會有人教人改1600X1120
曬出來後會有什麼分別？

[hktsoi]

如果以300dpi來計算, 3R即3.5" x 5"的解像是(3.5x300) X (5 x 300)
即1050 x 1500 pixels, 這已經足夠。過大的Pixels對相片的質素不單沒有幫助反而會令質素下降。但是1120 x 1600和 1050 x 1500 相差不多, 兩者出來的效果是沒有分別。

[midikorg]

請問..我想 曬/print 8 X 10 應該用幾大 pix ?

成日都見 dpi !
但都唔明 ?
e.g.(如果以300dpi來計算)
這個300dpi從何而來??

同 printer 上的什麼 xxxx X xxxx dpi 是否一樣?

[hktsoi]

其實數碼相機或影像檔案的解像度應該是ppi( pixel per inch) , 打印機才是dpi (dot per inch), 但是數字上的意思一樣, 所以現在都只用dpi

一般數碼相片輸出的解像度是 300dpi, 如果要輸出一張8R, 即8" x 10"
影像檔案需要pixel 是 8" x 300 dpi X 10" x 300 dpi = 2400 pixel x 3000 pixel 或叫 7.2M pixels, 不過, 用200dpi 也可以接受, 檔案需要pixel 便是 1600 x 2000 pixel 或 3.2M 便ok.

[SAM LAM]

I use 300D to take 6MP photo.
If I want to crop photo in 3:2 ratio to print 4R photo, Which figures should I use?
6MP 3072x 2048 300D
5MP ?
4MP 2464x 1632 D2H
3MP 2048x 1365
2MP 1800x 1200 Standard

Could U suggest any figures? Any simple calculations?

[SAM LAM]

REVISED

I use 300D to take 6MP photo, want to crop my photo to make it better.
If I want to crop photo in 3:2 ratio to print 4R photo, Which figures should I use? I want to reserve largest pixels so that I may print larger photo later. Fotomax tell me any thing better than 300dpi is good, is it true?

Are my calculation correct? e.g. Photoimpact X : Y = 1800 X 1200
300dpi 1800 x 1200 = 2.160MP
350dpi 2100 x 1400 = 2.940MP
400dpi 2400 x 1600 = 3.840MP
450dpi 2700 x 1800 = 4.860MP
500dpi 3000 x 2000 = 6MP

Could anyone suggest any figures? Any simple calculations?