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rose-ash/sexp_effects/effects/edge_detect.sexp
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Common Lisp

;; Edge detection effect - highlights edges
(require-primitives "image")
(define-effect edge_detect
:params (
(low :type int :default 50 :range [10 100])
(high :type int :default 150 :range [50 300])
)
(image:edge-detect frame low high))