eeColor 3D LUT Generation Settings

[Paul M]

I have an eeColor box that is connected to a Sony XBR-65A1E (OLED) television. The inputs are from an Xfinity cable box and a Roku 3.

When I profiled the television I used the following chain: i1 Display Pro 3 -> Laptop computer (running Intel graphics), DisplayCal and MadVR ->  eeColor box (CMS off during profiling) -> television. I used spectral color correction file created via an i1Studio spectrophotometer (from DisplayCal). For MadVR I had to set the EEC SII Repeater device properties within MadVR to PC Levels to get a black background in MadVR. If I used TV levels then the MadVR background would be gray and black test patterns were gray instead of black, so I assumed I needed to use PC levels. Also, within MadVR device properties for the EEC SII Repeater I set the native display bitdepth to 10 (which the Sony TV supports).

I generated a 3D LUT that I uploaded to the eeColor and the results, visually, appear to me to be excellent. Verification shows the results are excellent. However, I’m not sure I used the correct settings on DisplayCal’s 3D LUT tab. The settings I used were the following:

Source colorspace: (REC709 ITU-R BT.709)

Tone curve: Gamma 2.2 (this is what I preferred)

Apply calibration (vcgt): checked

Gamut mapping mode: Inverse device-to-PCS

Rendering intent: Absolute colorimetric with white point scaling

3D LUT file format: eeColor

Input encoding: TV RGB 16-235

Output encoding: TV RGB 16-235

3D LUT size: 65x65x65

My question involves the settings for the input encoding and output encoding. Since I used PC levels in MadVR (and that seemed to be correct to get black to be black on the TV) then what settings should I use for the input encoding and output encoding on the 3D LUT tab in DisplayCal?

Thanks, Paul

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[Florian Höch]

Hi,

16..235 is the correct encoding for the 3D LUT (you would notice if it weren’t because black would be lifted to gray).

Note the chain:

madVR (0-255) -> video card (converts 0-255 to 16-235 for TV output) -> eeColor (passthrough) -> TV (expecting 16-235)

An alternative would be to let the video card output 0-255 (desktop blacks would be crushed and white clipped) and set madVR to output 16..235. The outcome in terms of the 3D LUT would be identical though.

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