We are attempting to adjust our VGA input (ADV7842 in graphics mode) to get as good as colors as possible. We are using the same 24ohm / 51ohm voltage divider values on the VGA inputs that are on the ADV7842 eval board. I notice that in the ADV7842-VER.5.9c_AVEB.txt scripts that when in VGA mode that the manual gains are used and set like this:
44 73 EA ; Set manual gain of 0x2A8
44 74 8A ; Set manual gain of 0x2A8
44 75 A2 ; Set manual gain of 0x2A8
44 76 A8 ; Set manual gain of 0x2A8
This is provides very over bright results. Is there a method other than trial and error to pick acceptable gain values? Is using the manual gains the best method? I do not get very good results when the manual gain is turned off as well.