Image processing, control and timing

8.1 Processing is part of the display

The processor can improve a good source-display match, but it cannot create genuine detail that is absent from the source or overcome a fundamentally unsuitable pixel pitch. Processing quality should be judged with real content, motion, gradients and low light levels.

8.2 Scaling and native mapping

If source resolution and display resolution differ, an image must be scaled. High-quality scaling preserves edges and avoids ringing or moire, but small text and one-pixel lines can still change. Native content templates give designers predictable control.

For unusual canvases, a pixel map should identify active and unused areas, cabinet boundaries and any creative cut-outs. The content workflow should be tested before launch, not left until the screen is physically complete.

8.3 Colour management

Colour management aligns the source, processor, display and viewing environment to a defined target. It includes more than adjusting saturation. Relevant elements can include transfer functions, primaries, white point, matrix conversions, bit depth and luminance range.

Standard-dynamic-range and high-dynamic-range systems use different assumptions. ITU-R BT.2100 defines HDR television systems including perceptual quantiser and hybrid log-gamma transfer functions; the ITU announcement gives an accessible overview.

An LED wall can be very bright, but HDR is not simply "more nits". It requires controlled tone reproduction, suitable content, adequate black level and a consistent end-to-end workflow.

8.4 Synchronisation and genlock

In broadcast and virtual production, devices may need a common timing reference. Genlock helps align cameras, processors, render engines and displays. Frame synchronisation can resolve asynchronous sources but may add latency.

The result depends on the complete timing chain. A synchronised input does not guarantee that every pixel row emits at the same instant, because panel scan and driver timing remain part of the system.

8.5 Camera interaction

Cameras sample light through exposure windows, rolling or global shutters, sensor readout and frame timing. The display emits through PWM and scanning. When these patterns interact, the image can show bands, dark lines, colour separation, moire or brightness variation.

The European Broadcasting Union's virtual-production reports and later volumetric LED-wall analysis explore these interactions. Camera compatibility should be demonstrated with the actual camera class, frame rates, shutter settings, lenses and intended brightness range.

8.6 Redundancy and failover

Processing systems may offer backup inputs, mirrored controllers, redundant network paths or automatic failover. These features should be tested under controlled conditions and documented. A backup device that depends on the same power circuit, cable route or upstream source may not remove the most important risk.

8.7 Control and monitoring security

Network-connected displays are part of an organisation's digital estate. Control interfaces should be inventoried, access-controlled and kept on an appropriate network architecture. Default credentials, unsupported operating systems and uncontrolled remote access create risks unrelated to image quality.

Cybersecurity responsibilities should be allocated between the display owner, IT team, integrator, content provider and support organisation. Monitoring data can be useful, but it should not expose operational systems unnecessarily.

8.8 Calibration as a managed process

Calibration aligns pixels or cabinets to a target and can improve uniformity. The process may use camera-based measurements, factory correction data and processor-level adjustments. Because the detailed method is product-specific and can alter safety-critical or warranty-controlled configurations, this guide does not provide a calibration procedure.

For governance purposes, establish who owns baseline and correction data, who may authorise changes and which professional support organisation controls access to product-specific files.