[linux-dvb] BCS_CTRL and picture sharpness

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

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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