I misunderstood you, I thought you were referring to the video conversion app retaining HDR. I didn’t realize you were asking about the photo conversion app.

In regards to the photo conversion app (JPEG to PNG), I really only have a partial answer. When converting from ProRAW to .jpg, theoretically it should retain HDR, but I honestly don’t have a solid answer. Two reasons for this:

1). I’m not sure which version of .jpg the app converts to. If it converts to JPEG2000, then it would retain HDR. However, regardless, converting to a .png should retain HDR because .png does support HDR.

2). Since I have an iPhone 14 Pro, I unfortunately do not have the ability to manually enable and disable HDR photos, because the phone decides by itself whether it will shoot any given photo in HDR based on the environmental conditions.

If your phone does have the ability to manually toggle HDR “On” or “Off”, I would suggest taking a ProRAW photo with HDR enabled. If you then open the photo and tap on the “Information” button (the “I” in the circle), in the section that displays the photo resolution and size, there should be a badge that says, “HDR”. This confirms that the original ProRAW photo has HDR enabled.

If you then try converting that ProRAW photo to a .jpg in the photo conversion app, open the converted photo and tap on the “Information” button and see if there is still an HDR badge or not. If the HDR badge is not there, you could could also try to convert the original ProRAW to a .png and see if the HDR badge is still there.