PQ to HLG HDR Advanced Conversions v1.0

PQ to HLG Advanced Conversions v1.0 - SALE.png
PQ to HLG Advanced Conversions v1.0 - SALE.png

PQ to HLG HDR Advanced Conversions v1.0

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The MBOX PQ to HLG HDR Advanced Conversions are a set of LUTs designed to move from PQ HDR into HLG HDR, when non-standard brightnesses are required.

While PQ HDR uses absolute values (specific digital values equate to specific brightness outputs), HLG uses relative values, where specific digital values equate to a brightness above or below a reference value.

When translating from PQ HDR into HLG HDR, this concept must be accounted for, and we need to assign a specific PQ nits value to be the reference brightness value. The values listed in Nits provide the specific reference value required by HLG.

Please note that this is not the actual maximum value encoded, but the reference value. In linear terms, this equates to a value of "1" on a 0-1 scale, and is equivalent to the peak brightness of an SDR system. HLG retains 3.58 stops ABOVE this maximum value.

In order to determine the absolute peak value encoded, therefore, it's essential to multiply the Nits reference value by 12: a reference value of 100 nits records your PQ data in HLG up to 1200 nits.

Lastly, understand that these LUTs move from PQ into HLG HDR OETF, and do not account for any system gamma or maximum brightness value, such as SG 1.2 at 1000 nits for BT.2100 HLG. To compensate for the HLG system gamma, we recommend the MBOX HLG Add & Remove HLG System Gamma Display Precompensation LUT Pack.

For a demonstration of how the LUTs work and the problems they solve, visit our blog post here.


These LUTs are licensed for use in a post-production setting for applying to assets prior to the assets distribution.  If you are interested in incorporating these LUTs into HDR encoding, distribution, or exhibition technology, please contact us for more information on licensing.

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