Photos to Adobe Camera Raw?

Even unedited, raw images export to PSE as jpegs when I use the Image>Edit.

It seems to be a problem with Adobe programs. When I transfer RAW files, for example DNG to Preview with Edit with, they arrive as TIFF (I have to ensure, that it has not been edited by clicking "Revert to Original" before I use "Edit with").

You may want to get yourself the External Editors Photo Editing extension. It can pass RAW files as TIFF to Photoshop Elements (at least to my version). To other editors it can even pass the images as RAW files, but as soon as I select PSE, the option "Source: RW2" vanishes from the list.

Which version of Photoshop are you using? I am using Potosho CS6 and are seeing the same. Perhaps updating to a new ver sion will help.

For most other external editorsI am seeing, that RAW photos will be passed to the external editor as a TIFF file, which is sufficient fro my needs, since TIFF is a lossless format. However, if the image has been edited in photos, the edited version will not be passed as a TIFF, but as a JPEG file. To be able to edit a high quality file, I have to duplicate the photo and revert the copy to the original. Then I can pass a TIFF to the external editor.

If you pass the RAW file to Adobe RAW by exporting it from Photos, you could afterwards use the External Editors extension to pair the edited image returned by PSE with the original in Photos. At the bottom of the External Editors panel is a button "Replace original file". If you click this, you can add any image file as the edited version and can later use "Revert to original" to undo the external edit.

Thanks for the information. I'm using Photoshop Elements 2018, the latest.

has the photo you are trying to edit in PSE already been edited? Edited image versions can only be passed as JPEGs in "Image > Edit with", as far as I can tell.