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Invert filter — Invert Luminance Reverse grayscale only.
Original image
Filtered (example settings)
Invert Luminance filter inverses the grayscale component leaving the colors intact.
(Tip: Identical effect can be achieved by reversing the gamma (γ) channel of the Tonal curve tool. See page 359.)
Learn how to apply filters in general on page 363
Filter strength ranges from the unaltered original to reversed luminance.
Filter toolbar (learn more on page 365)
Select option "iii"
Original
Zero luminance
Reversed luminance
Infinite Painter’s Manual
ref: manual_listings_filters_invert_luminance
Appendices • Filters • Page 495
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