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Lumagen Radiance Pro

August 3, 2020

Lumagen Radiance Pro 424x series and 444x series

The Lumagen Radiance™ Pro 424x and 444x series video processors provide controls to calibrate a 1D LUT for grayscale, calibrate a 3D LUT for SMPTE video level signals, or calibrate standard CMS primary and secondary color points. The Radiance Pro processors provide a 4913 point (17x17x17) 3D LUT.

Note: The Radiance Pro models are not suitable for creating a 3D LUT for use with full range/PC levels.

The Lumagen Radiance Pro processors support Rec. 2020 color space and the BT.2084 HDR EOTF.

Note: The Radiance Pro is suitable for use as an HDR test pattern generator. We do not yet recommend HDR AutoCal with the Radiance Pro.

Calman can calibrate a display by automatically adjusting the Radiance Pro 1D LUT grayscale/gamma controls, automatically profile the display performance, create a 3D color calibration LUT, and then load the 3D LUT data into the Radiance Pro processor.

Or, Calman can automatically adjust the Radiance Pro 1D LUT grayscale/gamma controls and then adjust its CMS primary and secondary color controls.

Calman Recommended Workflows

  • Color Cube (3D LUT) to calibrate Radiance Pro grayscale/gamma controls and create a 3D color calibration LUT, or
  • HT Advanced or SI Advanced to calibrate Radiance Pro grayscale/gamma controls and CMS color controls.

Radiance Pro Required Firmware

Radiance Pro Control Connection

  • USB cable (serial cable can be used, at a slower speed)
  • Serial cable: DB-9 female to DB-9 female null-modem RS-232 cable (pin2 to pin3, pin3 to pin2)

Note: Radiance RS-232 Echo must be On for either USB or serial control.

  • Menu > Other > I/O Setup > RS-232 Setup > Echo: On

Device Driver Pack download

Portrait Displays provides a compiled pack of device drivers for most of the hardware devices supported by Calman, including the Lumagen Radiance Pro.

This Device Driver Pack is available on the Calman Downloads page, or with this download link

1D LUT and 3D LUT Calibration

Calman can calibrate the 1D LUT and the 3D LUT in the Radiance Pro and automatically load the LUT data into the Radiance Pro. To do so, in the Radiance Pro menu, set the Color Gamut Options to Enabled and select the number of 3D LUT Points:

  • Menu > Output > CMS’s > [CMS] > Color Gamut > Options > Enabled; Yes
  • Menu > Output > CMS’s > [CMS] > Color Gamut > Options > Points; [per model]

Calman Color Cube (3D LUT) Workflow

The Color Cube workflow in Calman is used to create display calibration 3D cube LUTs. In the Calman main menu, select Open Workflow Template / Color Cube (3D LUT). Proceed through each step of the Color Cube workflow in a normal fashion, using the following notes for Radiance Pro specifics.

Initial Setup

Session Setup – Meter Connect
  1. Connect your color meter to the Calman computer.
  2. On the Session Setup page, click the Find Meter button to connect your meter.
  3. On the Find Meters dialog, select your meter if it is listed, then click Search. If your meter is not listed on the Find Meters dialog, just click Search.
  4. Under the Target Display Type drop-down, for a colorimeter, select the setting that corresponds to the display’s backlight technology. For a spectrophotometer, no special selection is required.
Session Setup – Source Connect
  1. On the Session Setup page, click the Find Source button.
  2. On the Find Source dialog, under Manufacturer, select Lumagen
  3. Under Model, select Lumagen – Radiance Pro (USB)
  4. Click Connect
To calibrate a standard dynamic range (SDR) HDTV display:
  • On the Source Settings screen, for Dynamic Range, select SDR
To measure or manually adjust a high dynamic range (HDR) display:

Note: The Radiance Pro is suitable for use as an HDR test pattern generator. We do not yet recommend HDR AutoCal with the Radiance Pro.

  • On the Source Settings screen, for Dynamic Range, select HDR
  • If the display’s peak luminance is known, enter the display’s peak luminance in cd/m2 (nits) in the Max Mastering Display Luminance field and in the MaxCLL field.
Session Setup – LUT Device Setup
  1. On the Session Setup page, click the Find 3D LUT Device button.
  2. On the Find Display dialog, under Manufacturer, select Lumagen
  3. Under Model, select Lumagen – Radiance Pro (USB)
  4. Click Connect

Note: There is now a new 709 CMS Mode drop-down option for the Lumagen Radiance in the DDC controls on the Calman Display Control panel.  This option allows you to select how the Radiance applies a 3D LUT; Linear or Source (perceptual space). Linear is the default; this is how the Radiance has always worked prior to this new option.

Display Calibration

In the Display Calibration section of the Color Cube workflow, there are provisions for calibrating both a 1D RGB LUT (1D Ramp LUT page) and a 3D cube LUT (3D Cube LUT page)

1D Ramp LUT page
  1. On the 1D Ramp LUT page, click the AutoCal action button in the lower right.
  2. On the AutoCal Setup dialog, click OK.
3D Cube LUT page
  1. On the 3D Cube LUT page, click the AutoCal button in the lower right.
  2. On the AutoCal Setup dialog, under Calibration Type, select the desired type of 3D LUT calibration process.
    • IR Profile (time-based): Creates the best quality display calibration 3D LUT possible in the selected period of time. You select how much display quality you have time for, from 30 minutes to maximum display quality (6,000 points max). Uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first.
    • IR Profile (point based): Creates the best quality display calibration 3D LUT possible with the selected number of measurement points (1,000 – 10,000 points). Uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first.
    • Lightning LUT: Creates a display calibration 3D LUT in five minutes or less. Produces a very high-quality result on professional displays with moderate linearity. Displays with significant nonlinearity may produce marginal results.
  3. Under Video Range, select SMPTE (16-235) if you are calibrating a video display that clips or compresses signals above reference white, as tested on the Calman Dynamic Range page.
  4. Click OK.

Upon completion of the AutoCal 3D hardware LUT calibration process, Calman automatically loads the optimized 3D LUT calibration data into the Radiance Pro.

Grayscale and CMS Calibration

Calman can calibrate the multipoint grayscale and standard CMS primary/secondary colors in the Radiance Pro. To do so, in the Radiance Pro menu, set the Color Gamut Options to Disabled and 8 Points:

  • Menu > Output > CMS’s > [CMS] > Color Gamut > Options > Enabled; No
  • Menu > Output > CMS’s > [CMS] > Color Gamut > Options > Points; 8

Calman Video Calibration Workflows

The Home Advanced and SI Advanced workflows in Calman are used to perform standard grayscale and CMS calibration for video displays. In the Calman main menu, select Open Workflow Template / Home Advanced or SI Advanced. Proceed through each step of the selected workflow in a normal fashion, using the following notes for Radiance Pro specifics.

  1. On the Calman Settings tab (gear icon), under Workflow Basic Options, select Video (16-235) [SMPTE]
  2. On the Hardware Connect page, click the Find Source button, select Lumagen – Radiance series on the Find Source dialog, then click Connect
  3. On the Hardware Connect page, click the Find Processor/Display button. Select Lumagen – Radiance CMS on the Find Display dialog, then click Connect
  4. On the Dynamic Range page, adjust the display’s black level/Brightness control to 16
  5. Skip the Grayscale – 2pt page (no advantage to doing 2pt calibration before doing the following multipoint AutoCal).
  6. On the Grayscale/Gamma page, click the AutoCal button, then click OK on the AutoCal Setup dialog and wait for the AutoCal process to complete.
  7. On the CMS Calibration page, click the AutoCal button, then click OK on the AutoCal Setup dialog and wait for the AutoCal process to complete.
Tags:  LumagenRadiance Pro