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5.13 Rotate

Various rotates and flips. These work on matricies and images. Again, on the whole, very obvious.

Rotate_fixed etc.
As you'd expect. The 45 degree rotate is handy for rotating convolution masks.

Straighten_arrow
Mark an arrow on an image (open an image view window, hold down Ctrl, drag up and left), align the arrow along some edge in the image (maybe the horizon, or a painting edge), and click Straighten_arrow. The image will be rotated by the smallest amount that makes the lines you indicated with the arrow either horizontal or vertical.



John Cupitt 2003-07-21