Uploaded an enhanced version of LC-ImageToolbox that has
Matrix (Convolve up to 7x7) and ColorMatrix available.

This does here on a medium fast machine (2.5 GHz Mac mini)
a 5x5 convolve (e.g. Laplace filter) for a 1920x1080 image
using LC 8 in 1 second, using LC 9 in 850 millisecs!

You can easily change single matrix values "live" and also
add your own filters by using ready made template buttons.

Load LC-ImageToolbox_89_170 from "Sample stacks" (LC Toolbar)
or (slower) using
http://livecodeshare.runrev.com/stack/826/

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