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它是  8  位元色彩深度的顏色模式,最多只能擁有  256色。


  1. 每一幅圖像都各自擁有一張顏色表,而隨圖像不同,顏色表也不同。

  2. 檔案小,可製作成動畫,所以廣泛地用於網頁製作上。

  3. 它可製成透明背景的圖片。

  4. 只有灰度和  RGB  兩種模式,才能轉換成索引顏色模式。


  1. 隨樣性: 當圖像顏色數大於256時,使用該選項,  Photoshop  會定做顏色表。

  2. 實際: 當圖像顏色小於  256  時,使用該選項,就用實際的顏色製作顏色表。


  • 影像 — 模式 — RGB色彩