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If you’d like to rotate or flip an entire image, click “File,” then “Open.” Select the image you wish to rotate and click “Open” once more. Navigate to Image >> Image Rotation to view several options for rotation.  “180 degrees”:  Rotates the image ½ of the way around a complete circle. “90 degrees CW”:  Rotates the image to the right (clockwise) ¼ of a complete circle. “90 degrees CCW”: Rotates the image to the left (counter-clockwise) ¼ of the way around a circle. “Arbitrary”: Allows you to specify the angle you’d like to rotate the image. You’ll be able to type the angle (in degrees) as well as the direction (clockwise or counter-clockwise). “Flip Canvas Horizontal”: Flips the entire image as if shown in a mirror (horizontally). “Flip Canvas Vertical”: Flips the entire image upside-down. If you’re not happy with the flip or rotate option you’ve selected, press Ctrl+Z (Windows) or ⌘ Command+Z (Mac) to undo the action. Open the File menu and click “Save As.” Choose a location to which you’ll save your newly rotated image.
Open your image in Photoshop. Select a rotation option. Undo your changes. Save the image.