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 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.
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Rotate Angle Properties
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Angle
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The rotation angle, measured in degrees.
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About
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The center of rotation, either the center of
the image or near the center of the image cursor.
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 Centroid
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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.
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Resize Image
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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.
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Edge Replacement
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These Properties define how "blank" pixels
are evaluated when the rotation bring non-existing data into the
output image.
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Method
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Defines the method used to assign values to
the edge pixels. The options Value
and Image Margin are described in the
section below.
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Edge Value
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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.
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Choosing the Rotation Point
The image is rotated about a point that can be
selected from the following options:
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Center: Rotates
the image about the center position.
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Cursor: Rotates
the image using the center of the
Image Cursor. There are two ways to do this:
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Centroid checked:
Rotates about the centroid coordinate near the center of the
Image Cursor.
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Centroid
unchecked: Rotates about the center of the
Image Cursor.
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:
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Image Margin: Mira
computes a value typical of pixels around the margin of the
image.
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Value: Mira uses
the pixel value you specify in the Edge
Value field. This can be an intensity value or a color
value. For example, 0 and 500.25 are intensity values, and
255,128,0 is a color value.
Related Topics
World Coordinate System
Rotating Images
Rotation Menu
Rotate Image
Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All
Rights Reserved.
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