[mythtv-users] Adjusting Brightness, Contrast, etc. Per Card?

[Matt]

Dunno, curious myself, anybody fooled with these settings as described 
in /usr/src/linux-2.4.x/Documentation/video4linux/bttv/Insmod-options

                chroma_agc=0/1  AGC of chroma signal, off by default.
                adc_crush=0/1   Luminance ADC crush, on by default.

changing these bttv.o module settings, shouldn't effect the pvr-250, 
correct?

Wonder if turning on automatic gain control for chroma would have a good 
or bad effect?  anybody done this?




William Powers wrote:

> Is there any way to bias the adjustment of brightness and contrast 
> (and hue and saturation) for each capture card?  My bttv card was so 
> bright that highlights were washing out and losing detail.   Adjusting 
> the card settings didn't help because those are overwritten at the 
> start of each recording.  So, the only way I could cure it was to I 
> reduce the brightness adjustment for every channel using MythWeb until 
> the bttv card looked ok - but now the output of the PVR-250 card is as 
> dark as the inside of a coal cellar.  If there is a per-card 
> adjustment, would someone please point me toward it?  If there isn't 
> already such a thing, I would suggest that a simple bias (+ / -) for 
> each setting to be applied arithmetically for each card would allow 
> you to keep the per-channel adjustments and still address card-to-card 
> differences.
>
>
>
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