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-rw-r--r--doc/filters.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index d75a1f5a78..62734e06e5 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8065,6 +8065,9 @@ Adjust contribution of input red, green, blue and alpha channels for output alph
Default is @code{1} for @var{aa}, and @code{0} for @var{ar}, @var{ag} and @var{ab}.
Allowed ranges for options are @code{[-2.0, 2.0]}.
+
+@item pl
+Preserve lightness when changing colors. Default is disabled.
@end table
@subsection Examples