[Digikam-users] Lossless rotation is lossy!
bast at abwesend.de
Fri Apr 18 21:32:02 BST 2014
> I cannot explain the behavior, I assume there is either a tiny logical detail
> that we do not see or some fact deep in the JPEG compression technique.
> It's at least symmetric.
> If you read my definition closely you will see that is does not require
> O = R90
> It only requires any lossless operation R to have an operation R' so that
> O = R'RO
True, you wrote this before and your definition is correct. Furthermore:
let R''= (2a+1)R90 where a=-n..0..n
Since the error is reversible and very small, I will and can live with it.
Thank you all for your responses.
>> Thread solved and closed. <<
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