[MPlayer-dev-eng] [PATCH] add -gamma as a command line option

[Alexander Strange]

On Mar 9, 2011, at 4:45 PM, Kevin DeKorte wrote:

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> On 03/09/2011 02:13 PM, Reimar Döffinger wrote:
>> On Wed, Mar 09, 2011 at 12:02:21PM -0700, Kevin DeKorte wrote:
>>> This patch adds -gamma as a command line option
>> 
>> Hm. Assuming this actually works there sure is nothing speaking
>> against it (and as far as I can tell it should work).
>> Just strange this comes up only now, seems there's really few people
>> caring about gamma?
> 
> Updated patch, including man page
> 
> Kevin

What is the mathematical operation of this?
I don't see what a value going from -100 to 100 has to do with gamma.

Then again, I never understood why the video driver controls on Windows have a "gamma" control starting at 0 instead of 2.4.

> 
> 
> Index: DOCS/man/en/mplayer.1
> ===================================================================
> - --- DOCS/man/en/mplayer.1	(revision 33063)
> +++ DOCS/man/en/mplayer.1	(working copy)
> @@ -3271,6 +3271,11 @@
> .PD 1
> .
> .TP
> +.B \-gamma <\-100\-100>
> +Adjust the gamma of the video signal (default: 0).
> +Not supported by all video output drivers.
> +.
> +.TP
> .B \-geometry x[%][:y[%]] or [WxH][+-x+-y]
> Adjust where the output is on the screen initially.
> The x and y specifications are in pixels measured from the top-left of the
> Index: cfg-mplayer.h
> ===================================================================
> - --- cfg-mplayer.h	(revision 33063)
> +++ cfg-mplayer.h	(working copy)
> @@ -199,6 +199,7 @@
>     {"saturation",&vo_gamma_saturation, CONF_TYPE_INT, CONF_RANGE,
> - -100, 100, NULL},
>     {"contrast",&vo_gamma_contrast, CONF_TYPE_INT, CONF_RANGE, -100,
> 100, NULL},
>     {"hue",&vo_gamma_hue, CONF_TYPE_INT, CONF_RANGE, -100, 100, NULL},
> +    {"gamma",&vo_gamma_gamma, CONF_TYPE_INT, CONF_RANGE, -100, 100, NULL},
>     {"keepaspect", &vo_keepaspect, CONF_TYPE_FLAG, 0, 0, 1, NULL},
>     {"nokeepaspect", &vo_keepaspect, CONF_TYPE_FLAG, 0, 1, 0, NULL},
> 
> 
> 
> 
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