Action Canvas
This action does NOT rescale the image, it only crops it or expands it with empty pixels with the background colour. Use the scale action for that purpose. If you want to add a border of a certain size, use the border action.
Width
The new width of the image.
Height
The new height of the image.
Resolution
Dots per inch. The value <dpi> keeps the default resolution of the photo.
Align Horizontal
Describes the horizontal alignment by percentage: from 0% (left), 50% (middle) to 100% (right).
Align Vertical
Describes the vertical alignment by percentage: from 0% (top), 50% (middle) to 100% (bottom).
Background Colour
The background colour in case the image expands.
Opacity
The opacity of the resulting image.