[01] SDR IMAGENO FILE
THE VISIBLE COLOR BASE.
SDR + GAIN MAP → JPEG ULTRA HDR
LOCAL ENCODER / ISO 21496-1 / NO NETWORK
/UPLOAD IMAGES
[02] GAIN MAPNO FILE
BLACK = 1× / WHITE = MAX.
[!]
SIZE MISMATCH
/GAIN MAP PARAMETERS
MAXIMUM BOOST4×
METADATA GAMMA1.5
HDR GUIDE
ULTRA HDR JPEG DISPLAY
/WHAT THIS APP CREATES
/HOW TO READ THE GAIN MAP
ABOUT
ULTRA HDR / LOCAL UTILITY
/ULTRA HDR
/DESIGN + DEVELOPMENT
ETIENNE MINEUR
LES ÉDITIONS VOLUMIQUES / 2026