Question about Cube file exported 3D LUT

[windroamer]

Hi.

I want to use exported 3d Lut file to image processing.

But I didn't find good description about Lut file.

Anyway, I adjusted colors then exported 3D Lut file as .Cube.
It seems likes below

Quote

#Created by: Affinity Photo (Serif Europe Ltd.)
TITLE "Fire"

#LUT size
LUT_3D_SIZE 64

#data domain
DOMAIN_MIN 0.0 0.0 0.0
DOMAIN_MAX 1.0 1.0 1.0

#LUT data points
-0.750000 -0.750000 -0.750000
-0.734127 -0.734127 -0.726190

.....

 

I don't know why it contains  negative number.

I think the range should be between 0 and 1.

 

I will be very appriciated for you if you explain about LUT file description.

Thanks.

[DWright]

Hi windroamer,

 

Welcome to the forum

 

Is it possible for you to send me a copy of your .afphoto file and the exported LUT .cube file as I have not been able to create a .cube file with negative data points.

[windroamer]

This is my file.

Thanks.

_DSC0841.afphoto