Convert UltraHDR jpg to HDR Heif

[Tumist76]

Hello! As you may be familiar, Google enabled ultrahdr JPG files to be shot on newest Pixel phones since Android 14. I have shot a lot of these since and now want to migrate to Apple Photos converting these JPGs to HEIC since they are smaller and compatible (in HDR) with Apple devices. Is it possible to convert such JPGs to HEICs without losing HDR data?

[bradh]

Can you upload a sample for testing? The specific content is not critical.

[Tumist76]

Sure thing!
File structure, if needed for context: https://developer.android.com/media/platform/hdr-image-format

[farindk]

Seems to use a Gain map comparable to HEIC. If they are compatible, and #1121 is integrated, it might be possible to convert between the two.