Re: [Motion-user] brightness and contrast of an USB cam

[Dan <da...@rd...>]

Hi,

----- Original Message ----- 
From: "Walt Shekrota" <in...@ca...>
To: "Dan" <da...@rd...>; "Motion discussion list" 
<mot...@li...>
Sent: Sunday, January 21, 2007 7:20 PM
Subject: Re: [Motion-user] brightness and contrast of an USB cam


> On Sunday 21 January 2007 03:42, Dan wrote:
>> Hi all,
>>
>> I have a spca5xx based usb webcam.
>> The picture in spcaviewer is excelent, but in motion is very very dark.
>> I have tried to use different valuse for brightness and contrast 
>> parameters
>> without luck.
>
> Where are you using these values? Should be in the threadx.conf. (unless I
> guess if its the only cam)
> I used the following....
> brightness auto
> contrast 85 (in lamplit room 25)
> quality 99
> These will depend on the camera though. Obviously experiment with the 
> contrast
> range.
The camera has a very good autosetting. In spcaview it automatically tunes 
brightness, constrast and white balance, producing a very good picture.
I have tried different values in threadx (the thread for that specific 
camera) without success.
I have another USB cam (Philips ToU Cam Pro - first version, pwc based) 
which work perfect in motion without the need to set those values manualy.
I think is somehow related with theway motion access the camera through the 
driver.
With another spca based cam (different sensor) I have succeed getting decent 
images by manually set the RED, GREEN and BLUE black level and gain in the 
modprobe.conf file. I cannot get the same result with this cam...

Thank you and best regards,
Dan

> -Walt
>
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