High dynamic range. Techniques that allow a digital image to show a wider contrast range than current image sensors can record in one file. Some cameras have firmware to do the processing.
An amount of radiation that is greater than that given in typical radiation therapy. HDR is precisely directed at the tumor to avoid damaging healthy tissue, and may kill more cancer cells in fewer treatments. Also called high-dose radiation.
HDR can also mean Hard-Drive Recorder. Device that uses a computer hard drive to store compressed digital audio and video signals.
High Dynamic Range. This is a lighting procedure designed to emulate the way that light levels in the real world vary over an enormous range. This is mostly achieved by the use of floating point textures and render targets (as well as using the suitable lighting algorithm); integer formats do not offer anywhere near the same range of values. Althou...
Hard-Drive Recorder. Device that uses a computer hard drive to store compressed digital audio and video signals.
Header + High Data Rate + High Dynamic Range (photography)
Acronym of Hard Disk Recorder. Any digital audio recording device which is based on a computer type hard disk storage device, rather than D.A.T. (Digital Audio Tape), CD etc.
Humanitarian Daily Ration, a variation of the MRE used to feed a single malnourished person for one day with 2,300 calories.
High Data Rate
High Dynamic Range, a photographic technique that layers three or more shots to create a surreal or fantasy visual aesthetic. Most explorers have a strong opinion either for or against the use of HDR.