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410071006 江柏叡

410071008 黃彥凱
WEB上的多媒體
   多媒體是指任何將文字與圖形、動畫、音訊、
    影像或虛擬實境結合的應用


                利用色彩豐富的
                圖形設計和影像
                來傳達訊息
多媒體-圖像
 圖像~以數位化的表達方式來表示非文字資訊,
  如繪圖、圖表或相片
 JPEG: 將圖像壓縮以縮小檔案大小,可減少
  儲存空間,但壓縮程度越高,品質會越差。但
  JPEG圖檔的目標即為影像品質和檔案大小之
  間的平衡
 GIF: 用於色彩單純的簡單圖表、型狀和圖形。

       PNG圖檔格式為GIF格式的改良
多媒體-動畫
 動畫~將一連串靜止的圖片依序顯示的效果
 Adobe Flash: 可將動畫加入網頁的網頁製作
  程式,目前被大量應用於網頁動畫。
 動態GIF: 數張GIF檔案結合成單一GIF檔案
多媒體-音訊
 MP3格式: 可將音訊檔案縮減,同時也能保存
  大部分原來的音質
 音訊串流: 將資料持續且平均的方式傳輸,此
  技術可以讓使用者一面傳輸檔案,一面存取和
  使用檔案
多媒體-視訊
 視訊~一組連續播放的影像所組成,大多數視
  訊伴隨著音訊。
 WEB上的視訊是由多個視訊檔案所組成,這
  些檔案必須在下載完成後方可撥放
 MPEG組織制訂出一套視訊壓縮標準,其中
  MPEG-4(MP4)被廣泛使用。另一常見的視訊
  革式為Adobe Flash 。
虛擬實境(VR)
   利用電腦模擬真實或幻想的環境,再利用三度
    空間(3D)的方式呈現,使用者可以探索模擬出
    來的3D影像
外掛程式
   所謂的外掛程式,是為了加強原來程式沒有的
    功能,而開發出的輔助程式。原則上外掛程式
    必須依附在原始程式中,也就是必須先安裝外
    掛程式所須的原始程式,才能執行它所提供的
    功能。但也不盡如此,也有些外掛程式不需先
    安裝主程式,可以直接使用。
常見外掛程式
   Acrobat Reader:觀看、列印和瀏覽PDF檔案




   Flash Player:觀看圖像和動畫
   Java:讓網頁瀏覽器能執行以java語言撰寫的
    程式,增加網頁的互動性

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