Scaling is not supported in pre-images. Height and width can be specified in a style, but pre-image is part of a style not an object that can have a style so it also cannot have a height and width assigned to it.
You could do it with prehtml, code the img tag you want directly into prehtml, it comes out in the same place as preimage.
This will require a different style to be used for html, because you don't want to specify preimage as well as prehtml.
Alternatively, the html tagset could be modified to scale the image the way you want, the scale could be hard-coded into the pre_post event.
Anything is possible, perhaps a new pre-image-scale option in tagattr would do the trick.
Eric
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