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Fine. Rotate an image to an angle that's not a multiple of 90 degrees and that is the same size, then rotate it back. Compare the old and new. They will not be the same, because of lost information.

I can't believe you don't know this -- rotating bitmap images at angles other than multiples of 90 degrees always loses information.

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Oh, yes. That's true. I thought you are talking about losing pixel.

But loss of information and loss of pixel content are the same thing. If you have an image with dimensions of, say, 1000 x 1000 pixels, and you rotate it other than a multiple of 90 degrees, you will lose much of the original pixel content. It's unavoidable.

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