位元深度(英語:bit depth)簡稱位深,描述每一儲存單位所含有之可用資訊數量。 位元深度也可指:

  • 色彩深度,即數碼圖像中每顆像素能夠儲存多少位元的色彩資訊。
  • 位元深度 (音頻),即數碼音頻中每次取樣能夠儲存著多少位元的振幅資訊。

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