Thanks for helping out, see my replies in ugly red below :-)
Tom, where are your photos now? Still on the iPhone? Or synced to your Mac with iCloud Photo LIbrary?
Yes, they are still on my iphone, not yet synced with anything.
I am a bit confused, because your question is in the Photos for Mac forum, but you mention you want to "empty my iphone storage"
I know, maybe the iphone forum was a better bet, but i guessed that there would also be photo-experts on this forum.
- can i export a live picture and choose the frame i want after the export? if so, how?
On your Mac you can export a live photo with "File > Export > Export unmodified Original". This will save the original high resolution still frame and a video clip. You can use Photos to extract a different still frame from the video (How to Extract Still Frames from a Live Photo in Photos for Mac), but frames extracted from the video will have a lesser quality.
Hmm, i was worried about that.
I would expect i could choose any still frame of the live picture in the same quality as the original.
If that is not possible in a way, what is the use of a live photo (apart from the mini video you can show on your iphone ?)
how is a exported HDR picture different then a normal .jpg ? what can i do with it after export ?
The HDR photos are JPEGs like other JPEGs. The only difference is, that they have been processed by the camera.app. Usually they will show more detail in the highlights and shadows than the regular jpegs, because they are a collage of three jpegs.
I would always export both the normal version and the HDR version, and keep the normal version as well, until I have carefully checked the HDR version, if it is good. The HDR version may be unusable, if the subject in the picture moved, while the three photos have been taken. That may result in bad motion blur in the HDR version, while the regular JPEG may be far better.
I follow your advice of comparing the HDR and the normal version, but i want to do this on a big screen and not on the phone.
If i understand correctly, the phone app already merges the HDR into 1 picture which then can be exported. You cannot "manipulate" it anymore (like you can for example manipulate a .RAW image) ?