HDR

A camera can only display a limited range in contrast (LDR images). Areas that are outside of this range appear as white (lights) or black (shadow areas) and in these areas there are no further details to be seen. To increase the contrast range of an image, capture images with different exposure settings. These are then merged into one image using software.

A camera can only display a limited range in contrast (LDR images). Areas that are outside of this range appear as white (lights) or black (shadow areas) and in these areas there are no further details to be seen. To increase the contrast range of an image, capture images with different exposure settings. These are then merged into one image using software. The process of producing HDR images can be divided into image capturing and image processing on the computer.


Producing HDR
:

  • Capture images using a tripod  
  • Manual focus
  • Remote shutter release or self-timer release
  • Image mode A/AV with unvarying diaphragm
  • ISO rate (low rate)
  • Bracketing (compensation +/- or manual)


Further processing happens at the computer using the required software. Here are some links to shareware:

 

Definitions

  • HDR- High Dynamic Range (high contrast range) as opposed to LDR - Low Dynamic Range (low contrast range)
  • DRI - Dynamic Range Increase – Method of increasing the dynamic range in an image to create an HDR image
  • HDRI High Dynamic Range Image – Image with high contrast range (high dynamic range)  
  • However, HDRI cannot be displayed in full
  • Tone-Mapping-Tool – here the high dynamic range images are changed to a contrast ratio that can be displayed