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Format of libraw_imgother_t.shutter

Sorry if someone already asked the question, I would've search for another topic but theres no search bar 😣

In the docs, the description of libraw_imgother_t's shutter field is only "Shutter speed":

https://www.libraw.org/docs/API-datastruct-eng.html#node-31:~:text=float...

But I don't know if its the APEX value (exif field "ShutterSpeedValue") or the plain seconds number (exif field "ExposureTime")

empirically I'd say it corresponds to ExposureTime since I have a file with a value of "0.004000000189989805", which rounds nicely to 0.04s = 1/250s (and Windows's Image preview thing shows 1/250 for the shutter speed), but just to be sure

Thanks a lot for this library! I'm using it through a WASM build for the web, for a local-only entomology research webapp :)

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