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

Vivitek HK2288 4K UHD Home Theater Projector Review – Calibration Settings: Calibration Presets Notes, Best Mode Calibration, Brightest Mode Calibration

Vivitek HK2288 Calibration notes

Note: The projector had over 107 Hours on the bulb before I calibrated it and took the light measurements. A brand-new bulb will most likely have slightly higher measured lumens.

The HK2288 has 5 modes: Movie, Night, Day, Presentation and User. I spent most of my time with Night, Day and Movie. All of these modes have the same controls. They all offer 3 color temperature options (Normal, Cool, Warm) with just a single-point (gain) grayscale adjustments. The gamma presets include 1.8, 2.0, 2.2, 2.4, S-Curve. It also offers up a full CMS (color management system).



A note about User mode: Along with Day & Night modes, User is also preset to warm color temp, however User warm preset is very green, not warm at all. It looked to me that User set to warm was really what other DLP manufactures call “native bulb”. This mode is the brightest and least usable IMO.

Best (dark room) Mode Calibration for 1080p and REC.709 – Night Mode

During my calibration of HK2288 I experienced an issue that is coming all too common with modern digital projectors, white level clipping. Basically, no matter what mode I was in the whites would clip below 235 no matter where or how low I set the contrast. I was unable to resolve anything higher than 228.

Now maybe that sounds very close and that I’m nit picking, but what bothered me was the fact that it could not be corrected. When working properly I should have been able to affect the white point a with the contrast control.



Normally when you over drive the white level (contrast) you will start to clip the whites, loosing detail in the brightest part of the image. Most projectors will clip just above their default contrast values which are often set at their 50% mark. “Video” levels are 16-235 while PC levels are 0 -255. When I calibrate any display, I set the black level (brightness) to resolve down to 16 and the white level (contrast) to 242 or so. I like to have a tiny bit of head room in the whites just in case there is some content that sneaks in higher than 235.

I preformed my best/dark room calibration using Night Mode (default lamp) as a starting point. Out-of-the-box was quite poor with DeltaE as high at 10. Remember we want to be below 3 and I always strive to hit 1 or less if the projector is capable. The average color temp was in the 8000K range (minus red, plus blue & green). The HK2288 offers only one set of RGB (gain) controls – which covers the whole range from 0 to 100 IRE – white) for white (greyscale) balance calibration.



Most projectors spit the range into two, which makes it easier to stay consistently 6500K – and properly balanced) or any other desired color temp. So, achieving a linear grayscale is limited a bit. After calibration I was able to average a DeltaE of 1 or below from 20 to 90IRE and a 4 at 100IRE and 2 at 10IRE, which is pretty good.

Vivitek HK2288 Night Mode Post-Calibration RGB Balance Grayscale Tracking (target D65)
Vivitek HK2288 Night Mode Post-Calibration RGB Balance Grayscale Tracking (target D65)

IRE Pre-Calibration Post-Calibration
10 IRE 7798K 6760K
20 IRE 8025K 6546K
30 IRE 8098K 6404K
40 IRE 8203K 6579K
50 IRE 8068K 6512K
60 IRE 8095K 6518K
70 IRE 8082K 6485K
80 IRE 8149K 6404K
90 IRE 8202K 6559K
100 IRE 8113K 6838K

Measurements taken at Mid-Zoom with Default Lamp.

Average Gamma Pre-Calibration: 2.29

Average Gamma Post-Calibration: 2.26 @ 784 Lumens

Selecting the projectors gamma to 2.4 actually averaged a 2.29 So I choose to calibrate to 2.20. With only RGB gain controls I was not able to flatten out the brightness bump seen at 90IRE. Average gamma ended up at 2.26.





Type Pre-Calibration Post-Calibration
Contrast 50 50
Brightness 50 50
Color 50 50
Tint 50 50
Color Temp Warm Warm
Type Pre-Calibration Post-Calibration
Gamma 2.4 2.4
Sharpness 5 6
HDR Control Auto Auto
HDR Settings Normal Normal
RGB Gain Offset
Red 110 n/a
Green 89 n/a
Blue 79 n/a

White Balance calibration settings for Night mode.

Vivitek HK2288 Night Mode Post-Calibration Gamma Log 2.18 Average Gamma (target 2.20)
Vivitek HK2288 Night Mode Post-Calibration Gamma Log 2.18 Average Gamma (target 2.20)

Brightest Mode Calibration for 1080P and REC.709 – Day Mode (boost lamp)

Next up I did a bright room calibration using Day Mode (boost lamp). Both pre and post white balance calibration performance was very similar to Night Mode. Post DeltaE was 1.5 or below from 20 to 90IRE and a 4 at 100IRE and 2.5 at 10IRE. With gamma set to 2.2 after calibration gamma hit a 2.02 average with my target set to 2.10.



Vivitek HK2288 Day Mode Post-Calibration RGB Balance Grayscale Tracking (target D65)
Vivitek HK2288 Day Mode Post-Calibration RGB Balance Grayscale Tracking (target D65)

IRE Pre-Calibration Post-Calibration
10 IRE 7883K 6763K
20 IRE 7797K 6610K
30 IRE 7993K 6555K
40 IRE 7943K 6558K
50 IRE 8030K 6557K
60 IRE 7963K 6521K
70 IRE 7973K 6591K
80 IRE 8038K 6540K
90 IRE 8047K 6498K
100 IRE 7969K 6777K

Measurements taken at Mid-Zoom with Default Lamp.

Average Gamma Pre-Calibration: 2.14

Average Gamma Post-Calibration: 2.02 (target 2.10) @ 983 Lumens



Type Pre-Calibration Post-Calibration
Contrast 50 50
Brightness 57 50
Color 50 50
Tint 50 50
Color Temp Warm Warm
Type Pre-Calibration Post-Calibration
Gamma 2.2 2.2
Sharpness 5 6
HDR Control Auto Auto
HDR Settings Normal Normal
RGB Gain Offset
Red 107 n/a
Green 96 n/a
Blue 96 n/a

White Balance calibration settings for Day mode.

Vivitek HK2288 Day Mode Post-Calibration Gamma Log 2.02 Average Gamma (target 2.10)
Vivitek HK2288 Day Mode Post-Calibration Gamma Log 2.02 Average Gamma (target 2.10)

4K with HDR – HDR Mode

Lastly, I performed a 4k/HDR calibration using Movie mode, although what mode you are in I don’t think matters. When you send the projector an HDR signal it locks into an unnamed (presumably HDR) mode. Under the image settings both Picture Mode and Gamma are grayed out. Under Advanced tab is where you find the HDR settings. There is HDRControl (Auto/Off) and HDR Settings (Normal, Details & User).



If you choose either Normal or Details you lose the ability to adjust any picture controls (i.e. contrast, brightness, color, CMS, white balance) so I selected User. Normal HDR seems to be near identical to User while Details seems to darken the mid to bright levels of the image.

The contrast control has no effect on peak white and acts more like a gamma control so I left it on its default of 50. Brightness raises the overall white levels and you will blow out the whites if you drive it much beyond its default of 72, so I left it there.

Pre-calibration white balance average 8100k with a plus blue and minus red. DeltaE was at 10 from 60 to 100IRE. After calibration DeltaE was at or below 3 across the entire grayscale. The ETOF (gamma) tracking was fairly linear.

Vivitek advertises the HK288 as a 4k/HDR capable projector but not BT.2020 (P3) capable. Picking what 4K attributes to use (or not to use) is not something you see in flat panels displays. But with no real standards in place for the consumer projector space, manufactures are free to do whatever they want. There are some 4K projectors that only do 4 (faux) K and don’t attempt either HDR or REC.2020.

Vivitek HK2288 HDR Mode (user) Post-Calibration RGB Balance Grayscale Tracking (target D65)
Vivitek HK2288 HDR Mode Post-Calibration RGB Balance Grayscale Tracking (target D65)

IRE Pre-Calibration Post-Calibration
10 IRE 7814K 6619K
20 IRE 7967K 6556K
30 IRE 8126K 6572K
40 IRE 8081K 6567K
50 IRE 8274K 6527K
60 IRE 8156K 6427K
70 IRE 7173K 6812K
80 IRE 8173K 6808K
90 IRE 6786K 6786K
100 IRE 6784K 6784K

Measurements taken at Mid-Zoom, Boost Lamp.

ETOF (gamma) Post-Calibration: Tracked fairly flat except for the low end which was slightly brighter than the target @ 974 Lumens.

HDR/Details rolled off the brightness towards the top end making for a darker whites.



Type Pre-Calibration Post-Calibration
Contrast 50 50
Brightness 72 72
Color 75 75
Tint 47 47
Color Temp Warm Warm
Type Pre-Calibration Post-Calibration
Gamma n/a n/a
Sharpness 9 2
HDR Control Auto Auto
HDR Settings Normal User
RGB Gain Offset
Red 108 n/a
Green 88 n/a
Blue 80 n/a

White Balance calibration settings for HDR mode.



Vivitek HK2288 HDR Mode (user) Post-Calibration (Electro optical Transfer Function) aka gamma
Vivitek HK2288 HDR Mode Post-Calibration (Electro optical Transfer Function) aka gamma

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