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-rw-r--r--doc/filters.texi18
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 14692a2148..57679cca5c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2412,6 +2412,24 @@ Apply 1x1 checkerboard effect:
@example
blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
@end example
+
+@item
+Apply uncover left effect:
+@example
+blend=all_expr='if(gte(N*SW+X,W),A,B)'
+@end example
+
+@item
+Apply uncover down effect:
+@example
+blend=all_expr='if(gte(Y-N*SH,0),A,B)'
+@end example
+
+@item
+Apply uncover up-left effect:
+@example
+blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
+@end example
@end itemize
@section boxblur