Gold Juanmelara - P4K2ALEXA POWERGRADE AND LUTS

Created using the same process as the P6K version, P4K2Alexa features a new 3x3 matrix that accurately matches the P4K to the Alexa. This is the same method used by high-end post houses to match digital cameras. And it offerrs many advantages over using a LUT. For more info on these advantages, and for a look into the creation process, visit the P6K2Alexa product page.

UPDATED 24.03.2020
Unlike every “to Alexa” conversion LUT or “Alexa look” inspired LUT out there, I don’t deliberately obfuscate the transform behind a LUT. It’s possible to see exactly what I do in every node which makes it impossible to hide snake oil.

WHAT’S INCLUDED
LUT VERSION
P4K to Alexa LogC ISO400 and ISO800 LUTs: Transform Blackmagic Design Pocket 4K Film Gen 4 to match the Alexa in it’s native LogC format. Two main versions, Input Scaled to work with data above 1.0 input, and Standard to work with software that doesn’t support the former feature. Standard also comes in two versions. ISO400 and ISO400->ISO800. The latter allows you to decode BRAW ISO800 images as ISO400 to prevent excursions above 1.0 input. Then the LUT internally increases the exposure to match native ISO800 footage. These LUTs will require a Rec709 output conversion such as one of the ARRI LogC2Video LUTs below or any other LUT or Color Space Transform designed for ARRI LogC footage.

ARRI LogC2Video LUTs: The latest ARRI LogC to Rec709 LUT in four different curves. Standard, Wide Dynamic Range (WDR), WDR Highlights and WDR Roll-Off. For a comparison of all four scroll down.

Post-Production Rec709 LUTs: The P4K BMDFilm to Alexa LogC conversion combined with the three Rec709 output LUTs above. Created at x65 precision.

In-Camera/On-Set Rec709 LUTs: Same as above but created at x33 precision for compatibility. Used to preview the transform on the P4K or external monitors. Designed to work when shooting ISO400, or ISO800 and above.

No Snake Oil

POWERGRADE VERSION
P4K2Alexa PowerGrade: Transform P4K BMDFilm or P4K Linear from BRAW to match the Alexa in it’s native LogC format. Basically the source code for almost everything above except for the Input Scaled and WDR versions of the LUTs.

The P4K2Alexa PowerGrade allows you to adjust all aspects of the P4K to Alexa transform. You can make adjustments to the core 3x3 matrix, adjust the shadow/highlight tint curve and tweak the highlight roll-off curve to taste.

P4K2Alexa ACES PowerGrade: The P4K2Alexa transform for use in ACES workflows.

ARRI LogC2Video LUTs: The latest ARRI LogC to Rec709 LUT in four different curves. Standard, Wide Dynamic Range (WDR), WDR Highlights and WDR Roll-Off. For a comparison of all four scroll down.

In-Camera/On-Set Rec709 LUTs: The P4K BMDFilm to Alexa LogC conversion combined with Rec709 LUTs. Used to preview the transform on the P6K or external monitors. Created at x33 precision for compatibility. Designed to work when shooting ISO400, or ISO800 and above.

No Snake Oil

LUT OR POWERGRADE?
If you mainly grade in Resolve, the PowerGrade is the way to go. The PowerGrade gives you maximum flexibility and quality, while also allowing you to make adjustments to the transform.

If you grade in Premiere or any other NLE, or you just want to apply LUTs to quickly get footage out, then LUTs are the way to go. Just be aware that the Input Scaled versions may not work correctly in your NLE. You may need to use the workaround or accept slightly clipped highlights.

CURVE COMPARISON
Along with the latest ARRI Rec709 LUT, there are three extra variations included.

Alexa Wide Dynamic Range (WDR) modifies the incoming image information with a pre-curve. The curve reveals extra detail in the highlights and shadows without modifying image saturation. It lowers the intensity and harshness of highlights without losing image definition and without making them appear dull and lifeless, which is common in curves that manipulate highlights/roll-off. It doesn’t shift middle gray, so it’s also suitable for in camera monitoring.

Alexa Wide Dynamic Range (WDR) Highlights is the same as the standard WDR version, but it only affects the highlights. The image from middle gray down is unaffected. Comparison image coming shortly.

WDR Roll-Off Introduces a film like roll-off into to the highlights. It will dull the highs, but the effect is reduced as it is under the WDR pre-curve. The roll-off can be fully adjusted in the PowerGrade version.

UPDATE HISTORY
24.03.2020

• Added an ACES version of the PowerGrade.
  
  
• Added a new version of the ARRI Rec709 LUT – WDR Highlights which applies the WDR effect but only to the highlights. This should produce better results with lower contrast footage.
  
  
• Changed the default behaviour of the PowerGrade so that it won’t change any settings in the RAW tab when applied.
  

03.03.2020 Initial release
https://juanmelara.com.au/products/bmpcc-4k-to-alexa-powergrade-and-luts

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