[MPlayer-users] why can not adjust gamma ???

[kofboy]

Guillaume POIRIER,
======= 2006-12-22 23:39:29 您在来信中写道：=======

>Hi,
>
>On 12/22/06, kofboy <kofboy at 163.com> wrote:
>> mplayer-users,
>>
>>
>>     Hi all, do u found that gamma adjust doesn't work while useing -vo cvidix adn fbdev?
>> when i send a conmand into fifo of mplayer, contrast, brightness, hue, saturation can be
>> adjusted but gamma can not. Image looks no change both add gamma to 200 or set gamma to zero.
>
>You'd have to use -vf eq2:
>
>       eq2[=gamma:contrast:brightness:saturation:rg:gg:bg:weight]
>              Alternative software equalizer that  uses  lookup  tables  (very
>              slow),  allowing  gamma correction in addition to simple bright-
>              ness and contrast adjustment.  Note that it uses  the  same  MMX
>              optimized  code  as -vf eq if all gamma values are 1.0.  The pa-
>              rameters are given as floating point values.
>                 <0.1-10>
>                      initial gamma value (default: 1.0)
>                 <-2-2>
>                      initial contrast, where negative values result in a neg-
>                      ative image (default: 1.0)
>                 <-1-1>
>                      initial brightness (default: 0.0)
>                 <0-3>
>                      initial saturation (default: 1.0)
>                 <0.1-10>
>                      gamma value for the red component (default: 1.0)
>                 <0.1-10>
>                      gamma value for the green component (default: 1.0)
>                 <0.1-10>
>                      gamma value for the blue component (default: 1.0)
>                 <0-1>
>                      The weight parameter can be used to reduce the effect of
>                      a high gamma value on bright image areas, e.g. keep them
>                      from getting overamplified and just plain white.  A val-
>                      ue of 0.0 turns the gamma correction all  the  way  down
>                      while 1.0 leaves it at its full strength (default: 1.0).
>
>Guillaume
>-- 

= = = = = = = = = = = = = = = = = = = =

thanks for your repling.

Do u mean i can't adjust gamma while runing mplayer? 
it's hard to find the right value of the current video.

i remember that gamma can be adjusted real-time useing overlay video renderer under windows.
does vidix use overlay functions like windows video renderer?

				 
　　　　　　　　kofboy
　　　　　　　　kofboy at 163.com
　　　　　　　　　　2006-12-23