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? 發問於 電腦及互聯網其他 - 電腦 · 1 十年前

dpi、CMYB和bit 是什麼?

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:

sorry, 延長發問, 還是不太明白bit到底是什麼!

1 個解答

評分
  • 1 十年前
    最愛解答

    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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