GIMP Version: 2.10
Operating System: Windows
OS Version: 11
GIMP Experience: New User

List any relevant plug-ins or scripts:
RawTherapee

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Hello,
I have a very basic, very beginner question or two, please.
If I pre-process an image (a photograph take in raw mode) in RawTherapee and upon saving (as a .PNG file) & closing the image (then GIMP boots up), do I need to apply the same edits to the image via GIMP?

My second question is, is .PNG the correct file format to save images in RawTherapee for processing in GIMP?

Thanks,
fh

Yes, it's a lossless format like .TIFF
GIMP handle both formats in import and export

For comparison, if you don't compress them PNG and TIFF will result having ~the same size for the same image (depending the fine tune settings)

Well you can run RT as a Gimp plugin, but in practice you are going to spend quite some time in RT before you go to Gimp, so using them as separate applications is IMHO a better option.

To transfer files between the two, the best is lossless high-bit-depth TIFF (floating point) or 16-bit PNG. Plain PNG is 8-bits/channel only, and given that Gimp 2.10 can work with high-bit-depth images it is a shame to lose information early.