Rotate Angle


The Rotate Angle command rotate an image by a specified number of degrees. If the image is displayed top-down (row number increases downward), the rotation angle is measured clockwise.

Rotate Angle Properties

Angle

The rotation angle, measured in degrees.

About

The center of rotation, either the center of the image or near the center of the image cursor.

 Centroid

If selecting the Cursor option, check this box to have the center of rotation at a centroid position near the center of the cursor. For example, you may want the image rotated about the center of a star.

 Resize Image

Check this box to allow the image to be enlarged to hold all pixels after rotation. If this box is not checked, the image size remains the same and the corner pixels rotate outside the visible image.

Edge Replacement

These Properties define how "blank" pixels are evaluated when the rotation bring non-existing data into the output image.

Method

Defines the method used to assign values to the edge pixels. The options Value and Image Margin are described in the section below.

Edge Value

Defines the edge pixels to be a fixed value. If the image is a RGB image (like JPG, BMP, or TIF format), then a color value can be used.

Choosing the Rotation Point

The image is rotated about a point that can be selected from the following options:

If using the image cursor be sure to position it before opening the menu containing this command.

Edge Replacement

The "edge" refers to the blank pixels that rotate into the output image from off the edge of the original image. These pixels have no value but some values must be assigned to them in the rotated image. See the Examples.

Mira offers two options for assigning a value to the edge pixels:

Related Topics

World Coordinate System, Rotating Images, Rotation Menu, Rotate Image