High Dynamic Rang

High Dynamic Range (HDR) - method of obtaining images of a much wider tonal range than recorded by the camera in a single frame consists of creating a file, usually about 32-bit color depth, formed by the combination of several images of the same scene in different ways irradiated So that the individual frames correctly register all ranges, from light to shadow. Creating such a file requires several input files, their number depends on the tonal range of the recorded scene, from my experience that 90% of cases, sufficient 3 files recorded in increments of about 2 EV, in practice, we highlight three of the same time changing the aperture relations x0.25, x1, x4.