filter_kernels: add ewa_lanczossharp alias

This is essentially a preconfigured version of ewa_lanczos, with the
"best" parameters for general purpose usage.

1 files changed, 10 insertions, 2 deletions

diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index 4fdc0e26c7..1fa23f02cd 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -310,12 +310,20 @@ Available video output drivers are:
 
         ``ewa_lanczos``
             Elliptic weighted average Lanczos scaling. Also known as Jinc.
-            Relatively slow, but very good quality. The number of taps can
-            be controlled with ``scale-radius``. Adding extra taps makes the
+            Relatively slow, but very good quality. The radius can be
+            controlled with ``scale-radius``. Increasing the radius makes the
             filter sharper but adds more ringing.
 
             This filter supports antiringing (see ``scale-antiring``).
 
+        ``ewa_lanczossharp``
+            A slightly sharpened version of ewa_lanczos, preconfigured to use
+            an ideal radius and parameter. If your hardware can run it, this is
+            probably what you should use by default.
+
+            Note: This filter has a fixed radius. Use ``ewa_lanczos`` if you
+            want to adjust it.
+
         ``mitchell``
             Mitchell-Netravali. The ``B`` and ``C`` parameters can be set with
             ``scale-param1`` and ``scale-param2``. This filter is very good at