Lumagen User Guide

The range of Lumagen Radiance LUT boxes work with a combined 1D and 3D LUT for accurate display calibration when used in conjunction with LightSpace CMS

The Lumagen Radiance LUT boxes are HDMI input/output devices, ideal for use with any form of display that uses HDMI or DVI-D connections, making it a perfect for home theatre operations where precise colour management is required.

Depending on the specific Radiance box being used, connections include HDMI in, HDMI out, a Serial connection (requiring a USB to Serial converter), or direct USD port, for LUT uploading.


Overview

Lumagen Radiance LUT Box

The Lumagen LUT Boxes enable 3D calibration LUTs generated via LightSpace CMS to be uploaded into one of a selection of preset LUT location, selectable via a user infrared remote control.

When combined with LightSpace CMS the Lumagen Radiance LUT Boxes provide accurate colour management and calibration capabilities.

The size of the 3D LUT that is uploaded depends on the Lumagen LUT box being used, and LightSpace interrogates the Lumagen and uploads the correct format.

For further information on the capabilities of the Lumagen Radiance LUT Boxes see Lumagen website.


Lumagen Set-up Instructions

Instructions for performing LightSpace CMS display calibration with Lumagen Radiance LUT Boxes will vary depending on the specific Radiance LUT box being used, but the following information should cover most configurations.

First, make sure the Lumagen box in use has the latest firmware installed by visiting the Lumagen Software Update page.


Set the Lumagen Box to Unity

Before starting calibration work ensure the Lumagen box is transparent when no calibration LUTs are loaded.

  • Using the Lumagen remote control re-set to factory default
    (Either use the 'Factory Reset option, or via the remote use 'Menu/0999', save the new settings and re-boot the Lumagen)
  • Connect the Lumagen to the LightSpace PC via a USB or USB to Serial cable
  • Select File/Upload from LightSpace, and select the active COM port
  • Select 'Null Cube' (if it is not automatically selected) and 'Upload'
  • If there is no LUT active with LightSpace the NULL Cube option will be ticked and greyed-out, but is operational.
    (As no other LUT is available the ONLY option is the NULL Cube)

The LUT Box is now set to unity, but may not yet be correctly configured.


Check Lumagen configuration

The Radiance LUT Box may need to be configured correctly for the display in use, and the correct configuration will vary dependant on the Radiance being used. The following is based on the Radiance Mini, but the basic information will be viable (to different levels) for any Radiance box.

The basic configuration to check is:

Input / HDMI / Type: Auto(???)
Input / HDMI / Level: Video/PC
Input / HDMI / EDID: Passback/Default
and
Output / Styles / Stype ? / HDMI Format / Type: Level=Vid/PC

The check is to look for incorrect black/white levels caused by incorrect Radiance settings.

To check for the correct set-up the following tests can be used.

  • Using a controlled video source display a black image
  • Change the In/Out HDMI options in turn and check for accurate black levels
    (A probe can be used to check black levels, as outlined below)
  • Generate a 'File/New' LUT, and use 'Edit/LUT Manipulation/Gamma' and set to 2.0
    (If the LightSpace license you have doesn't have the 'Edit/LUT Manipulation' option, use the LUT Image to make a similar gamma change via an external graphics program)
  • Using a controlled video source display the Light Illusion BrightnessCal image
  • Again, change the In/Out HDMI options in turn and test by uploading the Gamma Change LUT created above
  • When the correct Radiance configuration is set the Gamma LUT will operate correctly, altering the image Gamma, with no change to zero black

Example Testing for correct Black Levels and LUT Operation

When using a Lumagen Radiance LUT box for calibration you will need to make sure the box configuration is accurate, as outlined above. The following describes various settings and results for a Radiance Mini, using two different displays, modifying the HDMI In/Out options as outlined above.


PC Display
(Hover over the icons for additional information)
HDMI In HDMI Out EDID Nits Black LUT
PC PC Passback 0.046 Black correct LUT works correctly
PC PC Default 0.218 Black lifted LUT Lifts black further
PC Vid Passblack 0.218 Black lifted LUT works correctly
PC Vid Default 0.620 Black very lifted LUT works correctly
Vid PC Passblack 0.046 Black clipped at 16 LUT works correctly
Vid PC Default 0.046 Black correct LUT works correctly
Vid Vid Passback 0.046 Black correct LUT sees 16 as black
Vid Vid Default 0.218 Black lifted LUT works correctly

Home TV Display
(Hover over the icons for additional information)
HDMI In HDMI Out EDID Nits Black LUT
PC PC Passback 0.106 Black correct LUT lifts black further
PC PC Default 0.106 Black correct LUT Lifts black further
PC Vid Passblack 0.373 Black lifted LUT lifts black further
PC Vid Default 0.373 Black lifted LUT lifts black further
Vid PC Passblack 0.106 Black clipped at 16 LUT works correctly
Vid PC Default 0.106 Black clipped at 16 LUT works correctly
Vid Vid Passback 0.106 Black correct LUT works correctly
Vid Vid Default 0.106 Black correct LUT works correctly

When the correct configuration is found it should be propagated to all of the Radiance settings, and the remote control used to select the slot for LUT Upload.

Patch Generation for profiling

To perform display profiling using the Radiance as a Patch Generator first set the 'Upload / Calibration Patches' option to the desired size - Small, Medium, Full, Custom - and close the Upload menu.

Lumagen Upload

The Upload menu is located under 'File/Upload'.

When any 'Profiling' option is selected within LightSpace and the internal patch window is active (the LightSpace CMS internal floating patch window has been made active by clicking the small colour display box when using Quick Profiling or Manual Measure modes) the patch colour will be replicated on the Lumagen output. When connected to LightSpace, the Radiance box is set to 'Adjust' mode, so any LUT active with the Radiance will be applied to the patches generated. This enables any calibration LUT to be verified by re-profiling through the LUT when loaded within the Radiance box.

When starting any profiling form scratch ensure a 'NULL Cube' is first uploaded to the Lumagen to clear out any possible active LUT.


Calibration LUT Upload

When the Calibration LUT has been generated from the profile within LightSpace, so that it is the active LUT within the software, the 'Upload' function can be used (with Null Cube turned off) to upload the LUT to the active Lumagen slot.

The size of the 3D LUT that is uploaded will depend on the Lumagen LUT box being used, and LightSpace interrogates the Lumagen and uploads the correct format - for example 5^3, 9^3 or 17^3 3D LUTs.


Radiance PRO Options

Lumagen Options

The Lumagen Radiance Pro has an additional options menu, accessed via the 'Option' button.

This Options menu both reads the present configuration of the Radiance Pro, as well as allowing specific settings to be user configured.

The Options menu is predominantly aimed at the evolving UHD/HDR/WCG capable displays, but also includes global options, such as 'Disable input reset on NULL Cube upload'.

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