Affine
The Affine Transform module provides a way to warp the image into a different image. The affine transform
will use the four selected points to create a new image that is scaled, rotated and translated based
on the four coordinate points. This transform is useful for removing perspective distortion or
for straightening objects within the field of view.
Interface
Instructions
1. Green, Cyan, Purple, Blue squares - drag the squares to create a new rough transform
2. Coordinates - Use the text boxes to refine the coordinates
3. Options - select the interpolation mode. Pixel is fastest but blocky. Bilinear is smooth but slower.
4. Grid Size - specify a grid size that will be superimposed over the current image
to help in manual alignment.
Example
| Source | Affine Transform |
 |  |
| Perspective Correction |
 |  |
| Object Alignment |
 |  |
 |  |
Variables
Note that instead of coordinates in the coordinate text boxes you can enter variable
values using [variable_name] instead of a number.
See Also
Rotate
Scale
Translate
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