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PureTone eliminates unsightly colour casts in your greyscale for balanced, neutral output. It is exclusive to Brompton R2-based panels that have been calibrated with Dynamic Calibration.

It is common for many panel types to show a colour cast in darker greys or when using the panels at low brightness levels. Most content has dark and light areas, so this is a real problem that means you may not get accurate colours and true neutral greys.

It is also a common reason why panels that appear to be matched when displaying full brightness test patterns are obviously unmatched when displaying real content with darker areas.


LEDs and their driver chips are not perfectly linear, meaning that when asked to output a particular brightness they may not accurately achieve it.

Red, green and blue LEDs often have different non-linearities, which can lead to colour casts in greyscales.

PureTone builds on Brompton’s Dynamic Calibration technology to enable each panel type to be profiled. It can then compensate for the non-linearities ensuring true, clean, accurate colours and neutral greys at all brightnesses.

Before Dark Magic
After Dark Magic

PureTone depends on Dark Magic for additional effective bit depth in order to make very small fractional adjustments to the output drive levels.

Dark Magic improves the quality of the image or video showing on LED panels when they are operating at less than maximum brightness.


PureTone is especially useful for film and broadcast work, where screens are often run at much lower brightness to match camera exposures, and maintaining neutral colour output is critical to looking good on camera.

For more detailed information on this and other Brompton Technology products, technologies and features, please see our Documentation library with downloadable .pdfs

Tessera SX40

Brompton’s first 4K processor and the best LED processor currently available on the market. Used with the XD Data Distribution Unit to provide a comprehensive solution for 4K screens.

Tessera S8

A mid-range processor perfect for high-profile projects that don’t require large output capacity but want the full suite of Tessera processing features.

Tessera S4

A straightforward powerhouse processor built for large, high resolution LED screens, offering fewer creative features for competitive value.

Tessera T1

Designed for creativity, an ideal choice for smaller creative shows and displays that don’t need to output a huge amount of pixels.

Tessera M2

Brompton’s flagship HD LED processor, offering unrivalled creative and colour management features.