Image anchor. Origin point when this image is used as a layer in a template or composite image.
Also defines the default center point for rotation.
Two integer numbers, separated by a comma. Pixel offset relative to the top, left corner of the full-resolution image.
Overridden by anchor= (which in turn can be overridden with origin= ).
The center point of the image is used if this field is not present or if it is empty, and if this is a valid image record (i.e. if catalog::Path is valid).