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Originally Posted by DaleDe
I do not believe it is unreasonable to think that a user can rotate their device to see a picture.
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I wouldn't expect a user to rotate a desktop monitor or a laptop computer, though. ePUB is not only for handheld readers.
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I would not expect ePUB to address this issue. Perhaps screen resolution would be reasonable but most eBook readers scale the images already so that is one way to handle the problem.
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What would you (as an ebook creator) do with a large landscape picture? There are two basic possibilities:
1. Leave it in its natural landscape orientation. Most readers will be using a portrait reader, and will therefore not see the picture in full size, but "reduced" to have the image width fit the screen width. Some users will be able to change the orientation by rotating the device, that's fine.
2. Pre-rotate the image to make it "fit" in a portrait screen. Again, most readers will be using a portrait reader and see a rotated picture, they can easily rotate the device and see the picture as intended, some of them will have to disable the auto-rotation in their devices, though, or they will just see a smaller portrait picture in a landscape screen. Users with non-portable devices can't rotate the screen.
I would favour a variant where the natural orientation of the image is also specified in a CSS property, EXIF tag or whatever, and the reading software will handle it appropriate.