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>
18 lines
708 B
Common Lisp
18 lines
708 B
Common Lisp
;; Film Grain effect - adds film grain texture
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;; @param intensity float [0, 1] default 0.2
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;; @param colored bool default false
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(define-effect film_grain
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((intensity 0.2) (colored false))
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(let ((grain-amount (* intensity 50)))
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(map-pixels frame
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(lambda (x y c)
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(if colored
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(rgb (clamp (+ (red c) (gaussian 0 grain-amount)) 0 255)
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(clamp (+ (green c) (gaussian 0 grain-amount)) 0 255)
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(clamp (+ (blue c) (gaussian 0 grain-amount)) 0 255))
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(let ((n (gaussian 0 grain-amount)))
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(rgb (clamp (+ (red c) n) 0 255)
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(clamp (+ (green c) n) 0 255)
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(clamp (+ (blue c) n) 0 255))))))))
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