HDR - Radiance High Dynamic Range RGBE Format

• Read support for the most common RGBE (.hdr) format
• Samples are converted to 32 bit floating point (float) and normalized using a global tone mapper by default.
  • Support for custom global tone mappers
  • Alternatively, use a "null-tone mapper", for unnormalized data (allows local tone mapping)
• Unconverted RGBE samples accessible using readRaster
• Standard metadata support