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JPEG(Joint Photographic Experts Group)係一種有損數據壓縮方法,同同名嘅圖像檔案格式,由同名嘅專案小組(攝影專家聯合小組)針對相嘅特性而設計,但係亦都被人用喺其他嘅影像類型。
格式針對嘅其中一樣相嘅特性,就係假定正常嘅相唔會有一大片顏色完全一樣嘅部分,所以如果原圖其實唔係相,或者其他原因有一大片一樣色嘅部分,喺還原幅圖嘅時候畫質就會即刻變差,即係有所謂嘅 artifacts(臺灣譯 「假影」)。
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