Was our grumpy author aware of the "display" program?
I certainly was not and at first glance it seems to fit the bill.
I went to /usr/share/wallpapers and typed "display *png &" and after about a minute I am happily cropping, resizing, and tweaking colours. I can also merrily spacebar my way through the directory. Just left-click on the image and I think you will find much more than a scripting interface.
Obviously I have not spent a lot of time on it but the quality looks ok to me.
I was almost ready to go off and program "lwnedit" but now I think it would be a waste of time.
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