Allows you to crop or expand an image relative to the image’s current dimensions. Image Manager shrinks or expands each of the four sides of the image. It fills the expanded areas with transparency.
If you add the IMQuery transformation to a policy, use the im variable, and select Relative Crop, you can use a query string to crop or expand an image relative to the image's current dimensions. See Syntax and Examples for the syntax for the query string parameter.