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Color Calibration (VP)

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Disclaimer

 

Virtual Production is a complex topic. It is mandatory to understand the basic setup to be able to advance to the advanced techniques (for example set extension and multi pos war).
Furthermore, it is mandatory to understand all the basic principles of Pixera. 

Here is a list of all the VP related documentation in chronological order:

 

XR System Design 

Unreal Engine (5.2.1) Setup 

Unreal Engine Pixera Setup 

Pixera Connect (Unreal Engine Plugin) 

Studio Camera (Virtual Production) 

Set Extension (Virtual Production) 

Multi-Pos Warp 

Color Calibration (VP) 

 

 

Introduction

 

A major challenge in virtual production environment is the color matching of led volumes and cameras. This part is crucial for a believable result for the viewer. There is a new auto color calibration introduced in Pixera 2.0 which is covered in this article. 

 

 

 


 

Technical Setup

 

Start in the compositing tab. Create a new folder in the Resources called ColorRefs:

 

 

IMPORTANT

The folder and the upcoming ressources are case sensitive. They must be named as stated in this article. Otherwise the calibration will not work.

 

 

Add four “Color Resources”. They must be named Color1, Color2, Colo3, Color4:

 

 

Add them to your volume. Place them in every quarter of the volume. They must not cover the whole screen. Rename the layers (just for reference and easier navigation).

Note:
This process must be repeated for each individual screen element in Pixera. 

 

 

 


 

 

Calibration Process

 

After finishing the prerequisites, we can now execute the calibration. 

In mapping tab you have to select your display and scroll down to Auto Color.

 

 

Click on the Add button and name your calibration.

 

IMPORTANT

An output must be assigned to execute a calibration. If there is no output connected the following error message will be displayed:

In case back projection is activated for the camera: deactivate the back projection in case the calibration is executed with the same camera!

 

 

Following the assignment of the calibration name we can now hit the edit and Calibrate button.

 

 

IMPORTANT

To achieve satisfactory results, the camera must be color calibrated. Furthermore, it is advised not to run the calibration with ultra sharp cameras as this can lead to the moiré effect.

 

 

 

In the calibration options window, the color refs placed on the screen must be matched with the ones visible on the cameras feed.

On the left side of the window, you see the representation of the screen. You must move the four squares with the numbers to match the corresponding color refs. Down at Reference Camer pleas select the Studi Camera you want to use for Color Correction.

After selecting the camera, you should see the output signal on the right-hand side. Your camera should point at a right angle to your LED screen and the four-color refs should be visible. You must move the four squares with the numbers to match the corresponding color refs here as well.

 


 

Following the start of the process, Pixera will display different colored content and match the color to the received image from the camera for each of the quarters. 

 

 

As soon as the process has been finished you have multiple options for where to use this calibration.

You can either use it for the entire LED screen or just for inner frustum.

If you want to use it for the entire screen, you are already done.

If you want to use it just for inner frustum, please set the Auto Calibration back to none. Switch to the compositing tab and select the Studio Camera. Scroll down to the “Auto Color” option and select the correct calibration profile. 

 

 

IMPORTANT

Calibration must be executed for each camera and output individually. 

 

 


 

Luma Offset

 

 

This feature behaves like the multi pos warp feature. Depending on the viewing angle the “Rotation-Based Luma Modification is applied. Hit the edit button and select configure. This will bring up the Luma Offset options:

 

 

 

 

Rotate your camera slightly via the Y axis and adjust the Luma offset with the slider underneath for this position. By pressing the plus button, you can now rotate the position of the value in the list. Please make sure that the values in the table are sorted in ascending order by Y rotation. You can reorder them with the arrow keys. 

You must activate “Use Pose Table” to make a smooth fade between those values when rotating your camera after finishing the adjustments.

 

 

Pixera 1.9.144 | 3.October 2023

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