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authorNiklas Haas <git@haasn.xyz>2017-10-25 17:05:52 +0200
committerNiklas Haas <git@haasn.xyz>2017-10-25 17:24:27 +0200
commitc2d4fd0ef43e44c5c8caee13ae486ae05784c3a5 (patch)
treec5b7ca23177655b20cc2da382b6b175e6476ceef /DOCS/man/options.rst
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vo_gpu: change --tone-mapping-desaturate algorithm
Comparing mpv's implementation against the ACES ODR reference samples and algorithms, it seems like they're happy desaturating highlights _way_ more aggressively than mpv currently does. And indeed, looking at some example clips like The Redwoods (which is actually well-mastered), the current desaturation produces unnatural-looking brightness fringes where the sky meets the treeline. Adjust the algorithm to make it apply to a much larger, more gradual brightness region; and change the interpretation of the parameter. As a bonus, the new parameter is actually sanely scaled (higher values = more desaturation). Also, make it scale based on the signal level instead of the luminance, to avoid under-desaturating bright blues.
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diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index 6d1ff4df5a..5c4882883a 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -4896,14 +4896,15 @@ The following video options are currently all specific to ``--vo=gpu`` and
some drivers, so enable at your own risk.
``--tone-mapping-desaturate=<value>``
- Apply desaturation for highlights that exceed this level of brightness. The
- higher the parameter, the more color information will be preserved. This
- setting helps prevent unnaturally blown-out colors for super-highlights, by
- (smoothly) turning into white instead. This makes images feel more natural,
- at the cost of reducing information about out-of-range colors.
-
- The default of 2.0 is somewhat conservative and will mostly just apply to
- skies or directly sunlit surfaces. A setting of 0.0 disables this option.
+ Apply desaturation for highlights. The parameter essentially controls the
+ steepness of the desaturation curve. The higher the parameter, the more
+ aggressively colors will be desaturated. This setting helps prevent
+ unnaturally blown-out colors for super-highlights, by (smoothly) turning
+ into white instead. This makes images feel more natural, at the cost of
+ reducing information about out-of-range colors.
+
+ The default of 1.0 provides a good balance that roughly matches the look
+ and feel of the ACES ODT curves. A setting of 0.0 disables this option.
``--gamut-warning``
If enabled, mpv will mark all clipped/out-of-gamut pixels that exceed a