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manpage: vo_opengl: change scaler descriptions and recommendations

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Based on suggestions by lachs0r.
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wm4 2015-01-21 22:22:42 +01:00
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DOCS/man/vo.rst
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@ -291,54 +291,30 @@ Available video output drivers are:
``lscale=<filter>``
``bilinear``
Bilinear hardware texture filtering (fastest, mid-quality).
Bilinear hardware texture filtering (fastest, low quality).
This is the default.
``lanczos2``
Lanczos scaling with radius=2. Provides good quality and speed.
``spline36``
Mid quality and speed. This is the default when using ``opengl-hq``.
``lanczos3``
Lanczos with radius=3.
Lanczos scaling with radius=3. Provides mid quality and speed.
Worse than ``spline36``.
``lanczos``
Generic Lanczos scaling filter. Set radius with ``lradius``.
``ewa_lanczos3``
Elliptic weighted average Lanczos scaling filter. Also known as
Jinc. Relatively slow, but very good quality.
``ewa_lanczos``
Generic elliptic weighted average Lanczos scaling filter. Also
known as Jinc. The radius can be set with ``lradius`` up to a
maximum value of 16, but note that performance drops very quickly
as the radius increases.
``spline36``
This is the default when using ``opengl-hq``.
``bicubic_fast``
Bicubic filter. Has a blurring effect on the image, even if no
scaling is done.
``sharpen3``
Unsharp masking (sharpening) with radius=3 and a default strength
of 0.5 (see ``lparam1``).
``sharpen5``
Unsharp masking (sharpening) with radius=5 and a default strength
of 0.5 (see ``lparam1``).
``ewa_lanczos4``
Better quality than ``ewa_lanczos3``, but slower.
``mitchell``
Mitchell-Netravali. The ``b`` and ``c`` parameters can be set with
``lparam1`` and ``lparam2``. Both are set to 1/3 by default.
Can be useful as special-purpose filter for downscaling.
``gaussian``
Gaussian filter with a parameter ``p`` for sharpness control.
``p`` can be set to float number between 1(blurry) and 100(sharp)
and has a default value of about 28.8 (see ``lparam1``).
Note that for extremely small value of ``p``, a large filter radius
might be required to avoid unintended artifacts (see ``lradius``).
There are some more filters. For a complete list, pass ``help`` as
value, e.g.::
There are some more filters, but most are not as useful. For a complete
list, pass ``help`` as value, e.g.::
mpv --vo=opengl:lscale=help