HDR Exposure Value Adjustments v1.1

HDR Exposure Value Adjustments v1.1 - SALE.png
HDR Exposure Value Adjustments v1.1 - SALE.png
sale

HDR Exposure Value Adjustments v1.1

150.00 300.00

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New in Version 1.1

  • Renamed all LUTs to move away from a Nits relationship to more accurate Exposure Values

  • Increased the granularity of EV adjustments

  • Added EV adjustments for HLG HDR, in addition to PQ HDR

  • Renamed LUT pack to reflect focus on Exposure Values

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The Mystery Box Exposure Value Adjustment LUTs are a set of LUTs designed to manage brightness adjustments in HDR10 or HLG while maintaining contrast.

Unlike a gain or brightness operation, these LUTs are HDR aware, and will preserve the overall contrast of the image as you scale up or down; that is, the contrast ratio between the brightest and the darkest part of the image is maintained as you change the overall peak values. All values will be pushed up or pulled down by the specified number of EVs / Stops, and the overall dynamic range of the image data will be preserved.

For both PQ and HLG, the following increments are provided:

±0.25 EV

±0.33 EV

±0.50 EV

±0.67 EV

±0.75 EV

±1.00 EV

±1.50 EV

±2.00 EV

±2.50 EV

±3.00 EV

±4.00 EV

Additionally, PQ includes a ±3.32 and HLG includes a ±3.58 EV. These represent a bidirectional move from specific output values. For PQ, this is a move from 100 to 1,000 nits, or from 1,000 to 10,000 nits. For HLG, this is a move from x 1 to x 12 peak output reference (or vice versa).

To relate exposure values in PQ to Nits of output brightness, it’s important to remember the relationship between Exposure Values and Linear Light:

+1 EV = 2 x Linear Light Value

Meaning a 1 EV increase to content mastered at 1000 nits peak will render the content at 2000 nits peak, while a 2 EV increase to content mastered at 1000 nits peak will render the content at 4000 nits peak, all while maintaining the overall image contrast.

More formally, the relationship is:

Linear Light Multiplier = 2 ^ EV

So a plus 0.33 EV adjustment would multiply linear light by 2^0.33 = 1.257.

EV LUTs may be combined to build the specific exposure compensation desired or required.

There are sixty six LUTs in this pack:

  1. 12 x HLG EV Adjustments Down (Pull Process)

  2. 12 x HLG EV Adjustments Up (Push Process)

  3. 12 x PQ EV Adjustments Down (Pull Process)

  4. 12 x PQ EV Adjustments Up (Push Process)

  5. 18 x Legacy branded HDR10 Nits Conversion LUTs

Also included in the legacy LUT pack are a series of hard-clipped direct conversions from HDR into SDR.  The nits rating indicates the clipped value.

There are three ways we’ve found these LUTs to be irreplaceably useful:

  1. Color Correcting for a higher brightness output than the display permits

  2. As quick exposure compensation LUTs during color correction

  3. As push / pull processing LUTs when intentionally underexposing or overexposing an image (Pair with the Camera HDR LUTs)

We can’t understate how many hours of work and costs these conversion LUTs have saved us and how they maintain authorial intent during the change in brightness operations.

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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