The problem with rotating an image is not knowing if the user reads with the device in profile or landscape mode. How annoying when you turn your device to look at the "sideways" image, and find that the device rotates the display so that the image is STILL sideways!!
Just code so that the image takes up the available width by using either width=100% or wrap it in an svg on it's own page. Most devices/apps have the ability to "zoom" on an image when you tap (or double tap) it. So if it is an intricate, hi-res, image that you are really proud of, and the user is really interested, they can take the 1/2 second to tap the image. If they aren't interested in zooming then they won't be annoyed by sideways images.
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