Squashed 'test/' content from commit f2edc20

git-subtree-dir: test
git-subtree-split: f2edc20cba865a6ef67ca807c2ed6cee8e6c2836

sexp_effects/effects/edge_detect.sexp

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+;; 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))