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add brighten_image script function, 'average' and 'offset' combine modes

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GenevensiS
2026-04-11 04:51:59 +02:00
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doc/function/brighten_image.txt
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Function: brighten_image
DOC_MSE_VERSION: since 2.6.0
--Usage--
> brighten_image(input: image, amount: brightening amount)
Brighten or darken an image.
To brighten use an amount between @0@ (no effect) and @1@ (entire image is pure white).
To darken use an amount between @0@ (no effect) and @-1@ (entire image is pure black).
--Parameters--
! Parameter Type Description
| @input@ [[type:image]] Image to brighten/darken.
| @alpha@ [[type:double]] Brightening factor.