Thursday a new post appeared on the Exodus Viewer blog explaining two features of this new viewer. HDR and FXAA. I had guessed, wrongly, that the HDR was High Definition Render. It is High Dynamic Range. My guess average is sliding down…

The article provides a good explanation of the subject terms HDR and FXAA. But, they don’t explain all the terms they use, like MSAA and others. So, I’ll give a try at an explanation too.
HDR
HDR or HDRI is High Dynamic Range Imaging. Exodus explains it and you can find more detailed information in the Wikipedia: HDRI.
If you have used film based photography or the older digital cameras you have run into RANGE problems. Neither could handle the range of bright and dark the eye can see. So, photographs and digital images never looked quite real because we could not see detail in the bright or dark areas of a picture. The top edge of tire in a car’s wheel well would disappear into the black of the wheel well.
Photoshop users can correct the problem to some extent using LEVELS or CURVES.


