dpi、CMYB和bit 是什麼？

用戶15713

2007-02-06 6:40 am

我想問有關dpi的問題，為何網站圖片的設定多數是dpi 72？
「1024 x 768px dpi 72」和「1024 x 768px dpi 300」的分別是什麼？
何謂CMYB？
儲存bmp格式的圖片時出現的8bit、24bit、32bit等又是什麼？

更新1:

sorry, 延長發問，還是不太明白bit到底是什麼！

回答 (1)

¦è»X¤ý¤l

2007-02-06 7:24 am

✔ 最佳答案

dpi = Dot Per Inch
在一吋內可以排列多少點,
通常用於打印機或Monitor(PPI), 點越多, 就表示它的Resolutoin 越高

The magical 72 comes from an old Apple machine whose physical resolution was 72 pixels over 1 inch of screen. This was useful because there's 72 postscript points in an inch, so 1pt on screen was 1px. Which meant that documents you saw on screen @ 100% were the same size as that document in real life.

CMYB = Cyan, Magenta, Yellow and Black
這是四色打印, 首三色可以混出所有色, 當然打印全張黑色時, 就用黑色

1 Bit = 0 or 1
2 bits = 2^2
8 bits = 2^8
24 bits = 2^24
32 bits = 2^32
The higher number of bit, you can present the bit map more precise.

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