Rotate image
Creates a new image identical to the currently-selected image, except that it is rotated by the specified number of degrees. The antialiasing normally performed during rotation can be disabled by clicking the ``Off'' button. Disabling antialiasing could be useful if it was desired for some reason to keep all pixel values close to the original.
Flip horizontally
Converts the currently-selected image or region into a
left-right mirror image of itself. For images 
8 bits/pixel,
only the selected color planes are flipped. Color planes can be
selected in the ``Config'' dialog box.
Flip vertically
Converts the currently-selected image or region into a
vertical mirror image of itself. For images 8 bits/pixel,
only the selected color planes are flipped. Color planes can be
selected in the ``Config'' dialog box.