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AJA's FS-HDR is a 1RU rackmounted universal converter/frame synchroniser, designed specifically to meet the High Dynamic Range (HDR) and Wide Colour Gamut (WCG) needs of broadcast, OTT, production, post and live event AV environments, where real time, low latency processing and colour fidelity is required for 4K/UltraHD and 2K/HD workflows. Developed in partnership with Colorfront, the FS-HDR’s HDR/WCG functionality is powered by Colorfront Engine™ proprietary video processing algorithms.

Following the latest software update the FS HDR is now a multi-channel appliance, up to 4 x 4K / Ultra HD, supporting both SDI and NDI. The latest update also includes new SDI embedded Dolby Vision dynamic metadata analysis, new narrative ARRI LogC4 WideGamut4 analyzer colour space and additional 8K format support. 


FS-HDR Colorfront Engine TV Mode

TV Mode is an operational mode that provides a simple to use transform selection interface with minimal controls required for live television production. It addresses colour correction and camera correction while adding two new controls essential for HDR/SDR transforms. These new controls are for Knee Point and Knee Slope and they help to manage highlights and roll-off in HDR to SDR and HDR to SDR conversions. They also improve the quality of the SDR output by using more of the information available in the HDR program.  Shouldn’t your SDR deliverable benefit from all the effort put into your HDR production?
The Colorfront Engine uses conversion algorithms based on the human visual system that provide better SDR to HDR colour transformation as well, improving the overall look of SDR sources used in your HDR production. 

To protect and maintain colour fidelity of SDR brand colours used in graphics or in-camera, the combination of SDR to HLG and HLG to SDR transforms using the Colorfront Engine TV Mode provides the necessary “round-tripping” capabilities.
A perceptual transform integrates the various human perceptual phenomena into a model or perceptually linear transform space. Unique to the FS-HDR Colorfront Engine TV Mode, transforms are calculated in this perceptual space. Dynamic range, surround illumination, colour volume, perceived saturation, and perceived hue are accounted for.

FS-HDR for Real Time HDR Workflows

Deliver more immersive content to audiences with the power and flexibility of AJA FS-HDR. See how FS-HDR and the Colorfront Engine can simplify real time HDR/WCG transformations and makes it easy to maintain the look you’ve worked to achieve across SDR to HDR, HDR to HDR, and HDR to SDR for both 4K and HD needs.

Learn more about the device’s extensive capabilities, including extensive camera log translations and more.

Real Time HDR Converter


The pursuit of High Dynamic Range (HDR) is the dream of getting closer to the Human Visual System (HVS) in all that we experience as viewers. FS-HDR has been designed to get us all there faster with a low profile, stand-alone, and real time device uniquely designed to bridge SDR to HDR, HDR to SDR, and HDR to HDR, all in real time.

HDR Conversions:

  • HDR to HDR 
  • SDR to HDR 
  • HDR to SDR

WCG Conversions:

  • BT.709 and BT.2020 

Up and Down Conversion examples:

  • Converting HD SDR BT.709 sources to UltraHD HDR BT.2020
  • Converting UltraHD HDR BT.2020 sources to HD SDR BT.709 or HD HDR BT.2020

Configurable Frame Delay

As sports fans have come to expect a more dynamic, interactive experience, augmented reality (AR) is quickly becoming a common and valuable production asset, but one that requires additional video processing time.  For seamless integration of AR into live productions, larger frame buffering capacities are required to delay other sources. 

FS-HDR offers the largest configurable frame delay in its class of up to 20 frames per channel, ensuring all sources stay in time.

FS-HDR Key Features

HDR to HDR, SDR to HDR and HDR to SDR conversions for Dynamic Range and Wide Colour Gamut needs.

Support for two Operational Modes:

  • Single Channel Mode for 4K/UltraHD or 2K/HD frame sync and conversion including HDR conversions
  • 4K/UltraHD/2K/HD/SD video processing and up, down, cross-conversion
  • A full range of I/O options for 4K/UltraHD including Quad 1.5G; Dual 3G; and Quad 3G, 6G and 12G over a range of Coax and optional Fiber choices
  • Enhanced Single Channel Mode offers the ability to simultaneously output 4K/UltraHD and 2K/HD with their own independent HDR transform settings for convenient Single Master HDR workflows.
  • Four Channel Mode for simultaneous independent 2K/HD/SD frame sync and conversion including HDR conversions
  • 2K/HD/SD up, down, cross-conversion
  • SD/SD aspect ratio conversion
  • HD/HD cross-conversion (720p/1080i)

 Each processing channel can independently select from:

  • Colorfront Engine TV Mode
  • Colorfront Engine Live Mode
  • Colorfront Engine Film Mode
  • BBC HLG LUT Mode
  • NBCU LUT Mode
  • User LUT Mode
  • Dynamic LUT Mode



33 point Tetrahedral 3D LUT Processor supporting:

  • Built-in BBC HLG 3D LUTs
  • NBCU 3D LUTs
  • User 3D LUTs
  • Dynamic 3D LUTs through 3rd party applications
  • Widely interoperable with 4K/UltraHD/2K/HD raster support, SQD and 2SI mapping conversion, P, PsF and Interlace support

Configurable HDR settings for SDI output VPID

HDR Colour Bar Test Patterns

HDMI HDR Infoframe generation to support HDR displays per HDMI v2.0b/CTA-861-G for any 2K/HD HDMI output format and 2K/HD output down-scaled from 4K/UltraHD

Audio I/O processing with a 272 x 208 matrix of audio possibilities; support for a flexible range of audio feeds from discrete AES to MADI and embedded SDI audio, with each audio input offering sample rate conversion

Simple operation, a redesigned FS menu structure and quick access to features via front panel buttons, as well as a web-based UI offering control over a LAN or across the web via a REST API

A 1RU frame offering space, power and cost efficiencies ideal for broadcast trucks, postproduction or broadcast settings


Parametric Controls for HDR Transforms and Colour Correction

FS-HDR provides parametric controls for Colorfront Engine’s HDR transforms and colour correction in Live, TV and Film Modes. Each parametric control is accessible via FS-HDR’s front panel, the web GUI on any browser, or REST interface, and settings can be stored to a preset for recall later or copied to other FS-HDR units.

Colorfront Engine parametric controls enable the following:

  • TV Mode:
  • Adjusting R,G,B, and Master color controls for:
  • Lift, Gamma, and Gain
  • Highlight and roll-off management with Knee Point and Knee Slope controls
  • Adjusting for camera correction with Exposure, Colour Temp, and Tint
  • Live Mode:
  • Adjusting R,G,B, and Master color controls for:
  • Lift, Gamma, and Gain
  • Film Mode:
  • Adjusting R,G,B, and Master color controls for:
  • Slope, Power, and Offset
  • Adjusting Saturation
  • Guiding the algorithm’s colour volume expansion from SDR to HDR
  • Adjusting for the Ambient Light in the mastering or viewing environment
  • Managing how SDR highlights and speculars are expanded into HDR
  • Controlling the overall look of camera log inputs between cinematic and television
  • Adjusting for camera correction with Exposure, Colour Temp, and Tint
  • PQ Output Nit Level adjustment from 48 to 4000 Nit
  • DCI P3 Colour Space Clamp for PQ output
  • Support for ITU BT.2408-0, Operational Practices in HDR Television Production.

Colorfront Engine Maintaining Perceptual Integrity

FS-HDR’s HDR/WCG capabilities leverage video and colour space processing algorithms within the Colorfront Engine,  specially licensed by AJA from Colorfront, and developed by Colorfront’s CTO Bill Feighter and Lead Engineer Tamas Perlaki.

Powered by the Colorfront Engine, FS-HDR’s extensive HDR and WCG processing support enable real time processing of a Single Channel of 4K/UltraHD/2K/HD including down-conversion to HD HDR  or up to four channels of 2K/HD simultaneously.  FS-HDR also enables the conversion of popular camera formats from multiple vendors into the HDR space, plus conversion to and from BT.2020/BT.709 as needed, critical for the widespread acceptance of HDR alongside SDR in broadcast and OTT workflows. 

Colorfront Engine TV Mode provides specific conversions and simplified controls for highlight and roll-off management in live television broadcast productions.

Colorfront Engine Live Mode provides conversions and controls that support live applications such as broadcast, OTT, A/V, and venue.

Colorfront Engine Film Mode provides conversions and controls, including ASC CDL,  for applications such as on-set camera preview and look creation.


Real Time Camera LOG Conversions

FS-HDR can take incoming imagery from some of the most popular professional cameras in the world today and convert their LOG output in real time to 4K/UltraHD or 2K/HD and output as either HDR or SDR. This greatly simplifies workflows in a mixed camera environment and provides for a unified input workflow to HDR or SDR capable switchers and more. Additionally, FS-HDR provides the ability to convert to Sony S-Log3 S-Gamut on output from any of these sources for workflows requiring this Log feed to compatible switchers and more.

  • Sony S-Log3 S-Gamut3
  • Sony S-Log3 S-Gamut3 Cine
  • Sony S-Log3 BT.2020
  • ARRI LogC Wide Gamut
  • Panasonic Vlog
  • RED Log3G10 Wide Gamut 
  • Canon Log2 
  • Canon Log3

ACES Support

The Academy Colour Encoding System (ACES) is becoming an industry standard for managing colour throughout the life cycle of a motion picture or television production. From capture through editing, VFX, mastering, public presentation, archiving, and future remastering, ACES ensures a consistent colour experience that preserves the creative vision.

FS-HDR offers an ACES Grading Colour Space with  ACEScct Input and Output Dynamic Ranges for real time integration with ACES workflows.



Colorfront Engine in Film Mode offers built-in LOOK selection including film stock emulation and popular aesthetic looks, valuable tools for on-set and episodic production and you can even mix between any two for unique specific aesthetic needs:



Look A or B Select

  • MasterLook
  • MasterBroadcast
  • MasterLookBright
  • MasterLookCool
  • MasterLookLowCon
  • MasterLookSoftColor
  • MasterLookVivid
  • MasterLookWarm
  • MasterPastelD60


  • MasterPastelD65
  • Agfa
  • ARRI K1S1
  • Bleach
  • ClassicFilm
  • Ektachrome
  • FilmBlended
  • FilmBlendedLoCon
  • FujiDI
  • FujiXD
  • GenericFilm
  • Kodachrome
  • ReversalClassic
A/B Mix

Inputs: Dynamic Range/Colour Gamut 

  • SDR BT.709 100 Nits
  • SDR Extended BT.709
  • PQ BT.2020 1000 Nits
  • PQ P3D65 1000 Nits
  • Hybrid Log Gamma BT.2100
  • HLG Extended BT.709
  • HLG Extended BT.2100
  • Sony® S-Log3 S-Gamut3
  • Sony S-Log3 S-Gamut3 Cine
  • Sony S-Log3 BT.2020
  • ARRI Log C Wide Gamut
  • Panasonic® V-Log
  • RED Log3G10 Wide Gamut
  • Canon Log 2
  • Canon Log 3
  • ACEScct

Outputs: Dynamic Range/Colour Gamut 

  • SDR BT.709 100 Nits
  • SDR Extended BT.709
  • PQ BT.2020 1000 Nits
  • PQ P3D65 1000 Nits
  • Hybrid Log Gamma BT.2100
  • HLG Extended BT.709
  • HLG Extended BT.2100
  • Sony S-Log3 S-Gamut3
  • Sony S-Log3 BT.2020
  • ARRI Log C Wide Gamut
  • ACEScct

Single Master HDR Workflow Using BBC HLG LUTs

AJA FS-HDR workflow


AJA FS-HDR workflow

Industry Leading Support

AJA’s technical support is recognised as among the best in the industry and is available to all AJA customers. If you need assistance with any aspect of your FS installation, configuration, operation or encounter any technical issue,  AJA Support will work with you to get up and running.

FS products are covered by a generous five year warranty. Please see the individual Product’s Manual for additional specifics around warranty conditions for the product itself.

AJA FS-HDR workflow