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Creating a LUT for the Brompton Tessera Processor in Calman

January 24, 2025

This guide walks you through the steps to calibrate an LED wall using the Brompton Tessera processor and Calman Ultimate software. While Brompton officially supports adobe.cube file formats, Calman can generate common.cube files, which may also work successfully.

Calibration Process

 

1. Prepare Your Equipment

  • Required Hardware:
    • LED wall with Brompton Tessera processor.
    • Supported colorimeter or spectroradiometer (e.g., Portrait Displays C6 HDR5000, Klein K10-A or CR-100).
    • VideoForge Pro (or equivalent compatible source)
  • Required Software:
    • Calman Ultimate or Studio (v5.15.9+)

2. Configure the Brompton Tessera Processor

  • Access the Brompton Tessera control software.
  • Navigate to the Color Calibration settings.
  • Confirm the processor is set to accept 3D LUT files for calibration.

3. Set Up Calman Ultimate

  1. Launch Calman
  2. From the Calman Menu in the top-left, choose Open Workflow Template → Calibration and then 3D LUT.
  3. On the introduction screen, click 3D LUT only to proceed to the hardware connect page.
  4. Connect Devices:
    • Plug your meter into a USB port on the computer and press the Find Meter button on the left.
    • Connect Pattern Source to your computer.
    • Connect to the Calman Cube Generator
      • On the Direct Display Connection tab, click the Find Display button.
      • Choose Manufacturer: Portrait Displays, Make: Cube Generator (3D LUT)
    • From the Direct Display Connection, change File Format to CUBE – common .cube formats
    • Click Next to proceed to calibration target settings and pre-calibration measurements

4. Perform Pre-Calibration Validation

  • Measure the LED wall’s current performance:
    • Take readings of grayscale, gamma, and color gamut.
    • Save this data for post-calibration comparison.
  • Click Next twice to proceed past the 1D LUT calibration and to the 3D LUT page

5. Configure 3D LUT Generation

  1. Set LUT Parameters:
    • On the 3D LUT page, click the AutoCal button
    • Configure the LUT settings to generate a 3D LUT using the common.cube format.
    • Ensure the resolution and size of the LUT are compatible with Brompton requirements (e.g., 17x17x17 or 33x33x33 points).
  2. Start Calibration:
    • Use Calman to run test patterns and gather measurements for the 3D LUT creation.
    • Calman will automatically calculate the necessary corrections.

6. Export the LUT

  • Export the LUT:
    • Save the LUT as a common.cube file from Calman.
  • Compatibility Check:
    • While Brompton officially supports adobe.cube, test the common.cube format for compatibility.

7. Upload the LUT to Brompton Tessera 

  1. In the Brompton Tessera software, navigate to the LUT upload section.
    1. 3D LUT Upload Instructions
    2. File format:
      • The file needs to be in the standard “.cube” format, which is widely used for 3D LUTs.
    3. Software required:
      • You need to use the Brompton “Tessera” software to manage the import process.
    4. Processor compatibility:
      • Only the Tessera SX40 and S8 processors can import 3D LUTs directly using the cube file format.
    5. Functionality:
      • Once imported, the cube file will be applied to the LED screen, allowing for precise color correction based on the LUT data
  2. Select the common.cube file exported from Calman.
  3. Apply the LUT to the LED wall and confirm the changes.

8. Post-Calibration Validation

  • Measure the LED wall again using Calman.
  • Compare the post-calibration results to the pre-calibration measurements.
  • Validate grayscale tracking, gamma, and color gamut coverage.

9. Troubleshooting

  • If the common.cube format does not work:
    • Consider using a third-party tool to convert common.cube to adobe.cube format.
    • Consult Brompton’s support team for further guidance.

Additional Notes

  • Automation: Incorporating Brompton into the Calman Ready Program would enable a more seamless, automated calibration process in the future.
  • Testing: If possible, test the calibration on a smaller scale before applying it to the entire LED wall.
  • Documentation: Keep a record of calibration settings, LUTs, and validation results for future reference.
Tags:  3DLUTbrompton