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BenQ TK800 4K UHD Home Entertainment Projector Review - Advanced Calibration

Posted on July 16, 2018 by Art Feierman

BenQ TK800 4K UHD Home Entertainment Projector Review – Advanced Calibration: CMS Calibration, Calibration Charts

CMS Settings for Best (dark room) calibration – User Mode (cinema 1)


The default CMS looked to be hand adjusted at the factory because the values for all six colors were not at their centered (default) positions. Pre-calibration primary colors weren’t too bad. Red was under saturated across the entire range, blue and green were over saturated a little. The 3 secondary colors especially cyan and magenta suffered from major hue errors with both colors positioned too close to blue. Cyan in particular had a wicked problem with 100% saturation jumping to the green side. This error could not be fixed only massaged to a better compromise. The most post-calibration improvements actually resulted from my white balance calibration. Actual CMS work made for only small changes.

CMS Settings for Brightest calibration – Bright Mode


Bright mode color gamut was similar to Cinema mode mainly due to both modes running Brilliant color on. Cyan tracked a little better this time but still had that weird plus-green error at 100% saturation. Yellow was worse, erroring towards green. The 3 primary colors (red, green & blue) were about the same and magenta had a similar plus-blue error just less server. Now just like with Cinema mode a lot of these errors were improved by white balance calibration with CMS fixing smaller errors especially with color luminance.

CMS Settings for 4K with HDR calibration – User 2 Mode


BenQ advertises the TK800 as reproducing the 92% of the REC.709 color gamut. So, it is presumed when watching 4K/HDR the incoming P3 color gamut is down converted to REC.709. What I found odd however that there is a Color Gamut adjustment in the user menu with REC.2020, DCI-P3, REC.709 and Auto selections. So why would they include REC.2020 & DCI-P3 if the projector only does 92% of REC.709? Why have a REC.2020 selection when there are no displays (projector or flat panel) that can even come close to REC.2020. Most 4k/HDR displays fail to reach a 100% of the DCI-P3 color gamut with all 6 colors.

Leaving the color gamut set to Auto seems the best choice as it’s the same as if you had selected REC.709. I measured both REC.2020 & DCI-P3 and neither were very good. They were similar in their poor performance. Red mid saturation points were way over saturated with 80% near the same as 100%, same with cyan. Yellow was too red and magenta was skewed toward red at 80 & 100% saturation. Blue was the only color that was correct.

With color gamut set to Auto the TK800 showed similar issues as my 1080p/SDR calibrations and improvements were made in the same manner with white balance calibration making the biggest improvement and with CMS fixing smaller errors especially with color luminance.

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