Dolby PRM User Guide

LightSpace CMS can be integrated with the Dolby PRM range of monitors for accurate Closed Loop display profiling and calibration.

The following instructions are for calibration of the Dolby PRM range of displays with LightSpace CMS.

Dolby PRM Calibration

Dolby Calibration

Calibration of the Dolby PRM range of displays with LightSpace CMS is simple, but due to some restrictions with network implementation within the display can prove awkward if the following steps are not followed precisely. If issues are encountered, turn everything off, and start again!

See the grey information box below for additional information on the possible issues that can be encountered.

Initial Setup
  • Connect the Dolby display to the LightSpace PC via a network, and start LightSpace CMS.
    (We do not recommend WiFi connections as interrupts can cause sync problems)
  • Navigate to File/Upload, and select the Dolby option from the 'Select the device type' drop-down window.
  • Either type the correct IP address in to the 'IP address' window, or select from the drop-down window if previously connected.
    Note: there are restricted IP addresses that cannot be used. Please check with Dolby for further information.
  • 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)
  • To make sure no LUT is already active with the Dolby display select 'Upload', with the NULL Cube box ticked.
  • Using the 'Calibration Patches' option select the desired patch size to use.
  • Close the 'Upload' menu.
Dolby Upload

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

Null Cube

When the 'Null Cube' tick box is used, all display settings are nullified, not just the 3D LUT. Should it be desired that display settings other than the 3D LUT remain as set, upload a real Null/Bypass 3D LUT (generated via File/New), as that will only 'null' the 3D LUT.

Although the option is labeled 'Null Cube', an actual Cube (LUT) is not necessarily loaded into the display, depending on the display's capabilities/options. A 'reset' command may be issued, rather than an actual Cube file uploaded.

Profiling & Calibration

To activate the internal Patch Generator within the Dolby display navigate to the desired profiling mode - Calibration Interface, or Display Characterisation.

When the patch window is activate (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 internal patch generator within the Dolby display will mimic the colour displayed, using the patch size pre-set via the 'Upload' window.

Profiling can then be performed as normal, using the probe connected to LightSpace, and with the Dolby displaying the required patches on screen during profiling.

Note: As the patch generator within the Dolby displays is relatively slow to respond to change colour instructions you will need to use the 'Extra Delay Time' within 'Probe Options' to add 3 to 4 seconds additional delay.

Dolby Connection Issue

Due to the way the Dolby network connection has been designed, it can be tricky to get to work...

We would strongly recommend using a simple network switch, and NOT using a direct cable connection. Most modern PCs and laptops have auto sensing ports that don't work correctly with a direct point to point cable connections.

Although setting the Dolby to dhcp makes the monitor receive an assigned address, we have had issues getting it to act as a dhcp server.

We would suggest manually setting the monitor IP address to, subnet mask, setting the PC to, subnet mask 255.255.255. Then using a simple network switch, with just 2 cables, connect the monitor and LightSpace PC. Once set up, confirm the connection via a 'ping', and then try the LightSpace connection.

If a connection can be made, and the LightSpace CMS patch generation works (remembering the required 'Extra Delay Time' for the slow response of the internal Dolby Monitor Patch Generator), but LUTs or a Null Cube cannot be uploaded, it is possible the monitor has 'Locked Permissions'. Such permissions will need to be managed for LightSpace to work correctly. Please contact Dolby if you are unsure how to unlock permissions.

LUT Upload

After profiling a Calibration LUT can be generated as normal, and with the LUT held within LightSpace navigate back to the 'Upload' menu, and with the 'NULL Cube' tick box un-ticked, the present LUT displayed within LightSpace can be 'Uploaded' to the selected 'Custom' location.

In this way, many different LUTs can be held within LightSpace CMS and quickly and easily uploaded into the Dolby display as needed, perfect for Look Management as well as accurate calibration to different standards.

Additional Technical & Support Info.

Additional Info: Dolby PRM Monitors
Additional Software Required: LightSpace CMS
LightSpace CMS Demo: Downloads
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