[linux-dvb] Re: BCS_CTRL and picture sharpness

["Dr. Werner Fink" <werner@suse.de>]

It seems that the BCS does nothing. Please can anyone of the
developers say how to change brightness/contrast/saturation
and picture sharpness?

        Werner

On Mon, Mar 11, 2002 at 05:25:34PM +0100, Dr. Werner Fink wrote:
> Hi,
> 
>      a simple question about picture sharpness: is there a
> way to de/increase picture sharpness?
> 
> I've found in saa7146_core.c within configure_saa7146()
> the line
> 
>         saa7146_write(saa7146_adap[i].mem,BCS_CTRL,     0x80400040);
> 
> which seems to be suitable for brigtnness, contrast, and saturation
> (as found in saa7146.c within calculate_bcs_ctrl_register()).
> I've also read in the SAA7146A_1.pdf that brigtnness is between
> is minimum 0x00, maximum 0xff, and defaults to 0x80, whereas
> contrast and saturation defaults to 0x40 and have their maximum
> at 0x7f.  This leads to somthing like
> 
>     0x80400040 = (brightness << 24) | (contrast << 16) | (saturation);
> 
> The question is: What's about picture sharpness? Is this something
> like (sharpness << 8) in the line above or does the SAA chip not provide
> ajustment of picture sharpness at all?  Any other way to increase
> or decrease picture sharpness?
> 
> 
>            Werner


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