Walhalla

Used to define the different types of rotations that can be applied to an image during a resize operation.

90-degree, clockwise rotation (to the right). This is equivalent to a quarter-turn of the image to the right; moving the picture on to its right side.

180-degree, clockwise rotation (to the right). This is equivalent to 1 half-turn of the image to the right; rotating the picture around until it is upside down from the original position.

270-degree, clockwise rotation (to the right). This is equivalent to a quarter-turn of the image to the left; moving the picture on to its left side.

Flip the image horizontally by reflecting it around the y axis.

This is not a standard rotation around a center point, but instead creates the mirrored reflection of the image horizontally.

More specifically, the vertical orientation of the image stays the same (the top stays on top, and the bottom on bottom), but the right and left sides flip. This is different than a standard rotation where the top and bottom would also have been flipped.

Flip the image vertically by reflecting it around the x axis.

This is not a standard rotation around a center point, but instead creates the mirrored reflection of the image vertically.

More specifically, the horizontal orientation of the image stays the same (the left stays on the left and the right stays on the right), but the top and bottom sides flip. This is different than a standard rotation where the left and right would also have been flipped.