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什么是HDR？
HDR的全稱是High Dynamic Range，即高動態范圍，比如所謂的高動態范圍圖象(HDRI)或者高動態范圍渲染（HDRR）。動態范圍是指信號最高和最低值的相對比值。目前的16位整型格式使用從“0”(黑)到“1”(白)的顏色值，但是不允許所謂的“過范圍”值，比如說金屬表面比白色還要白的高光處的顏色值。
在HDR的幫助下，我們可以使用超出普通范圍的顏色值，因而能渲染出更加真實的3D場景。也許我們都有過這樣的體驗：開車經過一條黑暗的隧道，而出口是耀眼的陽光，由于亮度的巨大反差，我們可能會突然眼前一片白光看不清周圍的東西了，HDR在這樣的場景就能大展身手了。
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