Crop an image to a given aspect ratio. This argument is given as a
crop and (optionally) a
keep setting. The values given here will override the preset settings (if present), can be given after every image, and apply only to the preceding image.
crop is given as an aspect ratio in the
attention- automagically keep parts likely to draw human attention. Default
entropy- Crop out the parts with the least variation.
centre- Keep the middle part.
Cropping happens before resizing; the preset
widths setting is a post-crop value.
More fine-grained control is beyond the scope of this plugin. I'm not writing an image editor here!