View Full Version : what are/is HDRI?

04-27-2005, 08:01 AM

I've been trying to look for the answer but i can't find it anywhere, in the threads in which HDRI has been used it just looked like a relfection map to me. Could someone please explain to me from scratch what it is? and what it's used for?


04-27-2005, 08:14 AM
hdri explained by the experts (http://www.google.com/search?q=hdri&sourceid=mozilla-search&start=0&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official)

04-27-2005, 09:56 AM
Pretty much the 'godfather' of HDRI Paul Devebec (http://www.debevec.org/)

excerpt from the Wikipedia :

In computer graphics and cinematography, high dynamic range imaging (HDRI for short) is a set of techniques that allow a far greater dynamic range of exposures than normal digital imaging techniques. The intention is to accurately represent the wide range of intensity levels found in real scenes, ranging from direct sunlight to the deepest shadows.

For example, this gives the opportunity to shoot a scene and have total control of the final imaging from the begining to the end of your photographie project. A concrete example would be that it gives you the possibility to re-expose. Basically, it is like being on set of location and capture the widest information as possible and choose after what you want. (JGWill-2004)

Greg Ward (Larson) is widely considered to be the founder of the discipline of high dynamic range imaging. The use of high dynamic range imaging in computer graphics has been popularised by the work of Paul Debevec.

04-27-2005, 10:33 AM
thanks for the replies guys

OK, so from what i can gather, in the real world some light areas are alot higher than 255,255,255 and thats what a HDRI does? if i'm right what would you use it in? what kind of scene?