406cc7c0c7
Add S-expression based video effects pipeline with modular effect definitions, constructs, and recipe files. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
14 lines
396 B
Common Lisp
14 lines
396 B
Common Lisp
;; Threshold effect - converts to black and white
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;; @param level int [0, 255] default 128
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;; @param invert bool default false
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(define-effect threshold
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((level 128) (invert false))
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(map-pixels frame
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(lambda (x y c)
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(let* ((lum (luminance c))
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(above (if invert (< lum level) (> lum level))))
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(if above
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(rgb 255 255 255)
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(rgb 0 0 0))))))
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