1個bit可以儲存兩種顏色
8個bit可以儲存256色 = 1個Bytes(位元組)
圖片大小計算
1 Bytes = 8 bit
以長640像素、寬480像素的圖檔為例
全彩 ( 24bit = 3Bytes ) 256 * 256 * 256 = 16,777,216 色
640 * 480 * 3Bytes = 921,600 Bytes = 900 Kb (921600/1024)
高彩 ( 16bit = 2Bytes ) 256 * 256 = 65,536 色
640 * 480 * 2Bytes = 614,400 Bytes = 600 Kb (614400/1024)
256色 ( 8bit = 1Bytes )
640 * 480 * 1Bytes = 307,200 Bytes = 300 Kb (307200/1024)
16 色 ( 4bit = 0.5Bytes )
640 * 480 * 0.5Bytes = 153,600 Bytes = 150 Kb
黑白圖片 ( 1bit = 0.125Bytes)
640 * 480 * 0.125Bytes = 38,400 Bytes = 37.5Kb
有錯推文說一下
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