In RGB, white is white, in HDRI, light has a much greater range and can capture the actual amount of light coming from each of these sources. If you look at a star in the night sky, it is also white, but may be 1,000 times dimmer than the light bulb. But if you look at the sun it is also white, but 10,000 times brighter. Join the ranks, support Poly Haven on Patreon. For instance, if you look at a 60 watt light bulb, it will be white. User Renders: Thanks to our Patrons for making Poly Haven possible. In HDRI, each channel holds more accurate values. nXt uses HDRI values throughout the rendering process, putting nXt into the classification of HDRR (High Dynamic Range Rendering) The range of color and light that can be contained in this format is much greater than the RGB scale of traditional computer graphics. So not only is color contained but the strength and brightness of the light at that point in the map. Instead of encoding colors like a computer monitor, using 24-bits of color for each pixel, HDRI is modeled after trichromatic base of the human eye and store actual luminance values in each pixel. HDRI is a much higher dynamic range of color and values than traditional bitmap formats.
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