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I also read that rotations of 90 or 180 degrees done within PS are lossless (actually the statement is that jpeg rotations of those specific magnitudes are lossless.)
If you rotate an image by 90 or 180 degrees, you do not degrade the quality of the image. Rotating by a different amount causes the image to be interpolated; hence, loss occurs.
This has nothing to do with JEPGs. This is all file formats. Rotating an image by an arbitrary amount blurs the image.
Photoshop can not do ANY losless JPEG transformations. If you open a JPEG, do anything to it (even just a Save As), Photoshop re-compresses it, and image quality is lost.
Is there any lossless rotation availably within PS or should I stick with Irfanview for that purpose.
There is lossless rotation. There is no lossless JPEG rotation.
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