Posted on February 17, 2019 By Phil Jones
LG HU70LA CineBeam ThinQ 4K Projector Review – Advanced Calibration: CMS Calibration, Calibration Charts
Expert Bright Room (Best SDR) Mode Pre-Calibration CIE 1976 Saturation Sweeps (target REC.709)
Expert Bright Room (Best SDR) Mode Post-Calibration CIE 1976 Saturation Sweeps (target REC.709)
Prior to calibration, the Expert Bright Picture mode (which I chose for SDR calibration), the color and CMS performance were just ok because the white balance averaged 8,300K because this pushed all the colors off their targets. Once the white balance was calibrated, all 6 colors improved greatly. Once the projector White Balance was fine-tuned, the CMS tracked very good out of the box. Except for Cyan, most CMS measurements are under 2 without any adjustments. In fact, the HU70LA projector’s REC.709 CMS tracking out of the box was better than many projectors even after the other units are given an hour of CMS adjustment.
HDR Cinema (Best HDR) Mode Pre-Calibration P3 Saturation Sweeps inside BT.2020
HDR Cinema (Best HDR) Mode Post-Calibration P3 Saturation Sweeps inside BT.2020
In the best 4K/HDR Mode, the CMS measurements had similar errors to those found with the Best SDR Mode before calibration. Just like with the SDR mode, improvements can be made by calibrating the white balance, but that’s where the similarities end. Since the LG HU70LA doesn’t have the color filter found on more expensive Home Theater projectors, it can’t reproduce 100% of DCI-P3
The LG HU70LA color gamut measured at 98.2% of rec.709. Using the CMS adjustments, I could only improve the lower levels. Aggressive CMS calibration to try to increase the saturation of Yellow, Cyan and Green resulted in excessive linearity errors. I focused on making improvements to their hues.
Overall, the DCI-P3 color performance could have been better but after calibration, the LG HU70LA still delivered a very good SDR and HDR picture.
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