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If you do it in most photo software programs, including photoshop, you resave as jpg and degrade image quality with generational and lossy issues.
The best way I find of doing it is use "thumbs plus" from cerious software cerious.com .
In thumbnail view you can select the ones you want to rotate, right click, choose "quick process" and then choose 90* Clockwise or counterclockwise. It rotates them without the lossy degradation of all other programs.
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