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Thank you, that's very

Thank you, that's very helpful. I'll go with LibRaw's sensor-size and ActiveArea then.

I actually care mostly about the DefaultCrop since that's what the users sees. I guess Adobe reads the final size from the MakerNotes (e.g., Sony has a FullImageSize tag) and then probably centers it in the ActiveArea. Will see if I can extract some of those with libexiv2.

To make it more complicated, there are also ImageWidth/Height Exif tags at least for Canon/Sony, which seem to also include user settings like 16:9 crop. Adobe (in DNG 1.4) interestingly translates that to DefaultUserCrop, which means the DNG includes 4 nested crops (sensor size, active area, default crop, default user crop)...