Re: RGB to Component video converter (SCART)

["Charlie" <charlieDOTd@verEYEzon.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
NpOdna707f6llNzbnZ2dnUVZ_qOpnZ2d@comcast.com">news:NpOdna707f6llNzbnZ2dnUVZ_qOpnZ2d@comcast.com...
> Charlie wrote:
>> "Michael J. Mahon" <mjmahon@aol.com> wrote in message 
>> V5adnbcn4JDnGKLbnZ2dnUVZ_revnZ2d@comcast.com">news:V5adnbcn4JDnGKLbnZ2dnUVZ_revnZ2d@comcast.com...
>>
>>>Charlie wrote:
>
>>>> As it stands now I get a usable but not perfect picture.  The only 
>>>> problem seems to be in the transition from one color to another 
>>>> horizontally.  For instance, if you have a line of horizontal black 
>>>> pixels which turn to white there will be one pixel at the transition 
>>>> that is gray.  This creates a horizontal ghosting effect that can be 
>>>> reduced by judicious adjusting of the contrast and sharpness, but some 
>>>> color combinations are worse than others.  I had the impression from 
>>>> past threads that this ghosting effect was caused by the monitor not 
>>>> being able to sync with the IIgs signal frequency.
>>>
>>>I presume you are using a digital monitor,
>>
>>
>> Yes, it is a combination 1440x900 (19" wide screen) LCD monitor and HD TV 
>> with just about every type of video input.
>>
>>
>>>and you are correct, the
>>>"intermediate" value pixel is the result of the sampling clock of the
>>>monitor not being locked to the dot clock of the IIgs.  If the pattern
>>>of gray pixels is constant and consistent over the width of the display,
>>>then your monitor may have locked to a multiple of the dot clock.
>>>
>>
>>
>>
>> Yes, the pattern is constant and consistent over the width of the 
>> display. I do want to make clear that this pattern is not very bad (at 
>> least to my eye). Its better than the fuzziness of my failing IIgs 
>> monitor and the picture is a lot bigger which is better for my failing 
>> eyes.
>
> You might want to check the monitor's menus for an "Image Lock" or
> similar submenu that would allow you to manually try to get a better
> sampling clock lock than the automatic mode is accomplishing.
>

Thanks for the tip Michael.  I took a close look at the monitor menu and it 
indeed had an "Image Lock" submenu.  Then reality set in.  That menu is 
unavailable when using the SCART input.  I have no idea why.  The 
documentation just says "Available in PC mode only".

Charlie