November 16, 2018

Give Your GH5/GH5s the ARRI Alexa Look with GHAlex LUT

GH5 GH5s ARRI ALEXA
Looking to make your Panasonic GH5 or GH5s more cinematic? Check out this new “ARRI ALEXA” GHAlex LUT!

Since first revealed at CES in 2015, we’ve been closely following Panasonic’s mirrorless flagship GH5 (and then the GH5s). While the micro-four thirds cameras offer powerful 4K video recording and have been an industry favorite for years - owners do have their concerns when it comes to the cameras’ ability to shoot cinematic footage.

Well, there is finally a possible new solution to ARRI Alexa-ize your GH5 and GH5s. But it just might cost you. Let’s take a look at Emotive Color’s GHAlex LUT!

ARRI ALEXA on Your GH5/GH5s

First, let’s quell some expectations here. Emotive Color’s GHAlex LUT will not make your GH5 or GH5s footage really look like it was shot on an ARRI ALEXA. Once we can get that big notion out of the way, we can look at what this creative look-up table (LUT) can produce some cinema-styled colors which can add a more complex and dynamic look to your compositions.

The GHAlex LUT

GHAlex LUT

As you can see in the image above, the Emotive Color’s GHAlex LUT comes in two different presets. They offer a “daylight” option and a “tungsten” balance (bottom and top respectively). Each option is built to prioritize skin tones to make them more natural and dynamic once you add the LUT (and even combine it with your full color grade).

Price and Reviews

In the video above by Cameron Gallagher, we get a peek into how the two GHAlex LUTs can be applied onto footage (wedding footage in this case) in his edit using DaVinci Resolve 15. While the initial looks can be quite drastic, there are times when the LUTs don’t work well - most often when dealing with overexposed scenes or darker compositions. It really comes down to a value proposition for you and your cinematography goals, to decide if the GHAlex LUTs are right for you.

What are your thoughts on the GHAlex LUT? Have any samples to share of your own? Hit us up in the comments below!     

Your Comment

10 Comments

What a joke!

November 16, 2018 at 2:12PM, Edited November 16, 2:12PM

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Jerry Roe
Indie filmmaker
1048

"Hey, Alex here (author of the GHa conversion)

I understand LUTs have a poor reputation, appropriately so, because they have often been used to achieve lackluster color, not geared for professional purpose (artifacts, garish saturation, weird hues). An uninspiring... something, not in any way connected to the cinema screen.

This is different. Since April of last year, I have continuously refined the model to achieve two things:

- Absolute accuracy to the Alexa's actual response (not just LogC format params), at every point in the color space
- Smoothness (silk gradients, not a single artifact)

How did I do it?

- Built my own sample system that measures ~27K color points for each camera
- Bought an actual Alexa Classic to iterate with (really)
- Coded a custom color engine to interpolate between those ~55K data points

One could think of it as an epic color chart match, of one color science to another cherished color science (well beyond a Resolve color chart match), with special provisions for rolloff. It is not an instant grade, a notion which runs counter to the ethos of the project (as in the PDF, at minimum the luma of each shot must be placed)

Additionally, the project has involved discovering and correcting for NLE distortions of formats and color grading tools (especially PPro), measuring and standardizing OLPF texture emulation, and developing a starting color base that rivals quality colorist pipelines (and emphasizes correct cinema luma placement). Raw footage side-by-sides are available for anyone to confirm, for themselves, the extent of the color science match.

The LUT format is a simple, elegant tool that may be used to achieve a thing of beauty, or most often, blunder. I hope you'll take a closer look with this one."

November 17, 2018 at 7:53AM

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not knocking on this LUT or anything but it's funny..after years of playing with every combination of LUT, picture profile, contrast adjustment, luminence range adjustment, master pedestal adjustments, etc etc etc etc

I finally set the GH5 to "standard" with no adjustments and BAM, there is a fantastic image. For me, i learned to sometimes trust the camera makers. They know wussup. haha.

November 16, 2018 at 5:00PM

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People are still pushing these bullshit LUTs!? Such a scam.

November 16, 2018 at 8:30PM

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Richard L
Camera assistant, DIT, DOP
260

Take a closer look. Over the past year, the response has been so positive, but there has been a group that doesn't actually look into what it is I'm doing, because of the prevailing reputation of look-up tables. Here is a response I gave on Reddit sometime back:

"Hey, Alex here (author of the GHa conversion)

I understand LUTs have a poor reputation, appropriately so, because they have often been used to achieve lackluster color, not geared for professional purpose (artifacts, garish saturation, weird hues). An uninspiring... something, not in any way connected to the cinema screen.

This is different. Since April of last year, I have continuously refined the model to achieve two things:

- Absolute accuracy to the Alexa's actual response (not just LogC format params), at every point in the color space
- Smoothness (silk gradients, not a single artifact)

How did I do it?

- Built my own sample system that measures ~27K color points for each camera
- Bought an actual Alexa Classic to iterate with (really)
- Coded a custom color engine to interpolate between those ~55K data points

One could think of it as an epic color chart match, of one color science to another cherished color science (well beyond a Resolve color chart match), with special provisions for rolloff. It is not an instant grade, a notion which runs counter to the ethos of the project (as in the PDF, at minimum the luma of each shot must be placed)

Additionally, the project has involved discovering and correcting for NLE distortions of formats and color grading tools (especially PPro), measuring and standardizing OLPF texture emulation, and developing a starting color base that rivals quality colorist pipelines (and emphasizes correct cinema luma placement). Raw footage side-by-sides are available for anyone to confirm, for themselves, the extent of the color science match.

The LUT format is a simple, elegant tool that may be used to achieve a thing of beauty, or most often, blunder. I hope you'll take a closer look with this one."

November 17, 2018 at 8:02AM

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Hey there, Alex here. I love that you got around to Emotive Color. I'd like to suggest a small correction -

Granted 1) the footage was shot under reference sun or halogen lighting 2) with a neutral WB 3) within the limited DR of the GH5, GHa really will make the GH5 (not the S) look *exactly* like the Arri Alexa at identical settings, with the same lens

The actual core conversion, which Cameron does not show in the video, is a technical transform to a measured LogC (through the lens). I supplied raw side-by-side footage from both cameras for everyone to confirm the match:
https://www.mediafire.com/#x3ub82eh21u63
There are post settings to simulate the OLPF texture, as measured in side-by-side. I have been recently researching an optical addendum to that, and will be publishing the details a bit down the road.

I understand why the qualifier was given, to tamp down expectations in the face of uncertainty. Also, the website is dated, with graphics and video going back to V1 (in the process of an update)

November 17, 2018 at 8:28AM, Edited November 17, 8:28AM

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Hey, your lut looks amazing. But what do you mean by "(not the S)" ? It's not as good with the GH5s ? (By the way, because of you, I discovered that firefox doesn't give great colors. Thanks. At first I was thinking "This guys has a red face" then I watched again with Chrome. My bad.).

November 28, 2018 at 1:16PM

1
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Ted
14

That's right, it was made for the GH5. The S will be non-reference; that said, I want to do it directly for the S soon (which will be an update to current 5 users). I just got a new Alexa last week for other camera conversions
The Firefox situation was a surprise to me too; the colors felt off and I thought it was the streaming sites at first. All the browsers are a bit off, except for Chrome with the Dev Fix

November 29, 2018 at 1:33PM

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Uh $65?
Not thanks.

An Alexa gets you the Alexa look.

Want the best look out of your GH5? Great lens, great lighting.

November 18, 2018 at 2:55PM

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Take a look at the raw footage side-by-sides from each camera - these are provided so that everyone may confirm for themselves that every single point in the VLog color space has been seamlessly matched to LogC, as measured through the lens. For some, this is worth it, and meaningful, and for others, its not. And that's ok with me.

November 18, 2018 at 5:35PM

6
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