Projector Reviews

Vivitek HK2288 4K UHD Home Theater Projector Review – Advanced Calibration

Vivitek HK2288 Projector Review – Advanced Calibration: CMS Calibration, Calibration Charts

CMS Settings for Best (dark room) calibration – Night Mode

BT.709 color gamut showed red, magenta and blue over saturated.  Using the projectors CMS (color management control) did help reduce their 100% saturation points but the lower in-between levels (i.e 80% 60% 40% 20%) levels are over saturated and could not be corrected with calibration. This issue seems rather common with other recent DLP projectors I have calibrated from Optoma & Benq.

RGBCMY Hue Saturation Gain
Red 110 97 110
Green 70 98 95
Blue 100 97 100
Cyan 71 79 92
Magenta 147 92 147
Yellow 60 97 112
Vivitek HK2288 Night Mode Post-Calibration DeltaE 2000 (target below error of 3)
Vivitek HK2288 Night Mode Post-Calibration DeltaE 2000 (target below error of 3)

Delta E is a metric for understanding how the human eye perceives color difference. The term delta comes from mathematics, meaning change in a variable or function. The suffix E references the German word Empfindung, which broadly means sensation. Simply put, look at Delta E as a measure of grayscale/color accuracy. 3 and under is considered ‘Excellent’ and imperceptible by the human eye.

CMS Settings for Brightest calibration – Day Mode (boost lamp)

RGBCMY Hue Saturation Gain
Red 108 98 100
Green 75 101 95
Blue 100 101 93
Cyan 88 82 88
Magenta 122 98 95
Yellow 71 100 100

Color gamut seemed to fair better in Day mode. It seems running the lamp in boost mode has a benefit beyond a brighter image by helping improve the color gamut performance. After calibration, nearly all of the mid saturation levels (i.e 80% 60% 40% 20%) are far more accurate.

Vivitek HK2288 Day Mode Post-Calibration DeltaE 2000 (target below error of 3)
Vivitek HK2288 Day Mode Post-Calibration DeltaE 2000 (target below error of 3)

CMS Settings for 4K HDR – HDR Mode

Note: These are the default values of my projector when viewing HDR (user mode). Yours may be a little different. I recommenced you leave yours at their default value.

RGBCMY Hue Saturation Gain
Red 105 100 100
Green 100 100 100
Blue 100 100 100
Cyan 147 91 100
Magenta 120 92 100
Yellow 105 100 100

While in HDR mode all of the colors in CMS were pre-calibrated from the factory, along with color set to 75 & tint set to 47, which I found a little odd. Measuring/calibrating BT.709 color gamut while in HDR mode was very difficult to do. I used an HDR workflow that allows me to measure a BT.709 color gamut within a BT.2020 container. Problem was no matter what options I tried with my calibration software some of the colors, especially magenta measured and looked way off. However, the colors in my SMPTE color bars test pattern looked good as did real-world content from my UHD blu-rays. So, I decided it was best to leave all 6 colors in CMS and color/tint alone.

Vivitek HK2288 HDR Mode (user) Post-Calibration DeltaE 2000 (target below error of 3)
Vivitek HK2288 HDR Mode Post-Calibration DeltaE 2000 (target below error of 3)