Load 5 bracketed images (same scene). The middle exposure will be used as 0 EV.
You should input 5 identical images of a color chart (ColorChecker 24 + grayscale 10) that differ only in exposure (e.g., -2 to +2 EV). These chart image sets can be downloaded from sources like DPReview.
No files loaded.
Step 2
Select “Sample Color” and click the 24 color patches in order (use Auto Grid or Manual).
Point 0/24. Click patches in order.
Step 3
Select “Sample Gray” and click the 20 grayscale patches in order.
Point 0/20. Click patches in order.
Step 4
Generate 3D .cube LUT for pseudo F-Log2 (BT.2020 gamut + F-Log2 OETF).
PNG/JPEG display RGB cannot be strictly restored to camera-native F-Log2.
This tool performs a pseudo conversion by assuming display RGB can be decoded to scene-linear reflection.