Hi there.
I'm stuck with the creation of files with a wide dynamic range (Smart HDR?) as iPhone 12 and later creates. They look bright on the OLED screen. What I'm trying to do currently is to create a HEIF or JPEG image with an embedded auxiliary grayscale HDR Gain Map. I have a script in Swift. It works well because I can see that AuxiliaryImageType (for HEIF) or MPImage2 for (JPEG) tag but my file still looks dull and flat. I didn't find anything in the Documentation. What might be wrong?