Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 223

HDR PQ Settings PQ in HDR PQ refers to the gamma curve of the input signal for displaying HDR images. HDR PQ settings enable the camera to produce HDR images conforming to the PQ specification defined in ITU-R BT.2100 and SMPTE ST.2084 (with actual display depending on monitor performance). Shots are captured as HEIF or RAW images. * HDR stands for High Dynamic Range. * PQ stands for Perceptual Quantization. 1. Select [ : HDR PQ settings]. 2. Select [HDR shooting ]. Select [Enable]. 223