您是尊贵的VIP会员，直接获取VIP独享内容链接:提取码: qfucHDRI拥有比普通RGB格式图像（仅8bit的亮度范围）更大的亮度范围。

标准的RGB图像最大亮度是值是255/255/255，如果用这样的图像结合光能传递照明一个场景的话，即使是最亮的白色也不足以提供足够的照明来模拟真实世界中的情况，渲染结果看上去会平淡而缺乏对比，原因是这种图像文件将现实中的大范围的照明信息仅用一个8bit的RGB图像描述。

但是使用HDRI的话，相当于将太阳光的亮度值（比如6000%）加到光能传递计算以及反射的渲染中，得到的渲染结果也是非常真实和漂亮的。

下面的两张渲染的图片可以看出使用HDRI后带来的巨大差异。

部分预览图：CGAxis HDRI Maps Collection Volume 2 contains 10 huge resolution, full spherical (360×180 degree) panoramic HDRI maps.SPECIFICATION:: Total size: 2.78 GBcontains 10 huge resolution, full spherical (360×180 degree) panoramic HDRI maps.CGAxis_HDRI_Maps_02_01360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_02360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_03360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_04360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_05360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_06360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_07360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_08360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_09360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.CGAxis_HDRI_Maps_02_10360 PreviewHuge resolution (15000px x 7500px) full spherical (360×180 degree) panoramic HDRI.32-Bit per Channel.