This command adjusts an image to fit control points. This image
adjustment applies when the image distortion varies and requires
more than a single translate, rotate and scale transformation. This
command changes the image file. The original image file is backed
up to a separate file with a .bak extension.
There are two methods to model the adjustment from the control
points. The Inverse Distance method weights the delta x/y from each
control point as the inverse of the distance to the control point.
This way the closer control points have a higher weight. The Mesh
Deformation method uses an affine transformation. The control
points can be either loaded from a file stored previously by Rubber
Sheet, or by screen picking. With picking, the control points are
defined by screen picking a point on the image and then the point
to move this point on the image to. In the example shown here, the
roads in the image don't line up with the road linework. After
picking the road points on the image and the corresponding points
on the linework, the image is adjusted to fit the road linework.
The Output Control Point Report generates a report of the control
point coordinates.
Image before Rubber Sheet showing control
pointsImage
after Rubber Sheet
Prompts
Pick origin of control point 1:pick point 1 Pick destination of control point 1:pick point 2 Pick origin of control point 2:pick point 3 Pick destination of control point 2:pick point 4 Pick origin of control point 3 (Enter to end):pick point
5 Pick destination of control point 3:pick point 6 Pick origin of control point 4 (Enter to end):pick point
7 Pick destination of control point 4:pick point 8 Pick origin of control point 5 (Enter to end):press
Enter
Pulldown Menu Location: Raster Keyboard Command: rasrubber Prerequisite: an Image