Squashed 'l1/' content from commit 670aa58

git-subtree-dir: l1
git-subtree-split: 670aa582df99e87fca7c247b949baf452e8c234f

sexp_effects/effects/threshold.sexp

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+;; Threshold effect - converts to black and white
+(require-primitives "color_ops")
+
+(define-effect threshold
+  :params (
+    (level :type int :default 128 :range [0 255])
+    (invert :type bool :default false)
+  )
+  (color_ops:threshold frame level invert))