Rotate

The Rotate command in the Image menu allows you to turn the image through an angle set by you. (Note that, in effect, the image canvas is rotated and therefore the image along with it. This is different from the rotate commands in Transform Image - see Transform Image - which turn a selection of the image without turning the canvas and therefore allow images to be "cropped" once they are outside the canvas area.)

There are set options for rotating through 90 degrees clockwise (90 CW), 90 degrees counter-clockwise (90 CCW) and 180 degrees. In addition, you can flip the image either horizontally or vertically. The most versatile command is Arbitrary, with which you can specify an exact angle of rotation, anywhere between 0 and 360 degrees, and choose to rotate either clockwise or counter-clockwise.

See:

Image menu