I used a GMIC filter to create a LUT file by comparing an HDR image (in avif) to my desired SDR tonemap, as demonstrated in this video https://www.youtube.com/watch?v=y8gDBT8_ALI
I saved to .cube directly from the plugin and then tried applying it with another filter. The result was pretty close to the original. But then I tried embedding this LUT to the HDR video where that image comes from and uploading, - the LUT is being recognized and acted upon by YouTube, but the output is very washed out in both colors and contrast.
Does anyone have experience with this workflow? Could you help me understand why the results don’t carry over to video, and if it can’t be fixed, what other alternative there is to making a LUT specifically with a before & after?
Attached are the following SDR images: 1) source, 2) the output when applying the LUT to the HDR image in G’MIC, 3) the output from YouTube (which I’ve confirmed, does respect embedded LUTs).
