IMAGE BASED HALD CLUT WORKFLOW

    Imaged Based Hald CLUT Workflow

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There are some limitations with LUT generation in DaVinci Resolve. One is the missing ability to add good enough metadata to the LUT, and that’s important because it’s used to inform the user about things like what color space it requires, the display it’s designed for, copyrights and size. 


Another limitation is that the LUT generation simply ignores some of your grades if you have applied unsupported effects or DCTLs to your node structure.

In the following example we’ll explain how to generate a LUT with a combination of supported and unsupported effects and plugins, in less than a minute.
 

1. Include all grades

Go to the shot with the grade you want to export, and confirm that all the nodes you want to include are enabled. Then, grab a still of the finished grade.
 

davinci_resolve_node_tree_3D_lut_hald_image_workflow_lowepost.jpg
 

2. Hald CLUT (Hald Color Look-up table)

Download the Hald CLUT image from the free Look Development Starter Kit by Ravengrade and import it to your timeline.

A Hald is basically a 2D pattern that can store the same color values as a 3D LUT, and with the same high precision. Be aware that not all Hald images available are designed good enough to store high-precision values, it depends on the size and the bit depth. The higher size and bit depth, the more precision. The recommended size is 3x64 and the bit depth should be 16 bit. To check the bit depth of your Hald image inside of Resolve, click the clip in the editing section and the information will be available inside of the metadata clip details.

The Hald image in the Look Development Starter Kit fullfills the requirements for high-end image based workflows, so you don't need to look any further.


3D_lut_hald_image_workflow_lowepost_show_lut.jpg

3. Resolution

Change the resolution of your timeline to match the resolution of the Hald image. In this example the Hald image is 3584x3584, so the timeline resolution should be set accordingly. Note that if only one of the pixels are set incorrectly, the grade will not transfer correctly so this is a critical step.

 

resolution_3D_lut_hald_image_workflow_lowepost.jpg


4. Copy the grade 

Now it's time to copy the grade from the still you have saved in the first step, and apply it to the Hald image.
 

image_3D_lut_hald_image_workflow_lowepost.jpg


5. Export TIFF

In the delivery tab, set the in and out points to mark one frame of the Hald image, and render it out as TIFF RGB 16 bits. That's an uncompressed format that contains all the color information you need.
 

tiff_export_davinci_resolve_3D_lut_hald_image_workflow_lowepost.jpg
 

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Hey,

What colour space each of the Mitch Bogdanowiscz LUTs are expecting?

Also, can you let us know what the different versions of the 2383 LUT are intended for?

Cheers

Jamie

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27 minutes ago, Jamie Neale said:

What colour space each of the Mitch Bogdanowiscz LUTs are expecting?

The name of each LUT states what it expects and what it returns.

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10 minutes ago, Tom Evans said:

The name of each LUT states what it expects and what it returns.

So the Cineon version is expecting R709/Cineon to output P3D65 G2.6?

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8 minutes ago, Jamie Neale said:

So the Cineon version is expecting R709/Cineon to output P3D65 G2.6?

Exactly, so you will have to transform your camera space to Cineon with a CST prior to the LUT.

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Just now, Tom Evans said:

Exactly, so you will have to transform your camera space to Cineon with a CST prior to the LUT.

Great, thanks for clarifying Tom, much appreciated.

What would be the case use for the P3 Soft Clip etc versions? would that be if you're already in the P3 space and want the 2383 look with gamut remapping?

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Is there anyway to create a 16bit Lut from the 16bit Hald file that has been provided on Windows. it seems only Lattice can do this. All of the Lut from Hald file programs and websites that I have found and used only create 8bit Lut files and seem to only accept 512 x 512 files resolution Hald files to build them from and not the 3584 x 3584 Hald file that was provided

 

Thank you in advance..

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On 1/9/2023 at 3:46 PM, Kenny Mosher said:

Will CST's be included in the LUT when using this method? Thanks

Kenny,

Yeah and ACES Transforms as well. Sorry , the screengrabs were placed in the wrong order after correcting the post.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Edited by randy thompson
Forgot one screengrab
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