On Mon, 21 Mar 2005, Richard Ellis wrote: > Do you have any hard and fast documentation on the resolution / error > rate / tolerance on the Canopus ADC converter? Otherwise, for a
The manual not handy at the moment
> consumer / pro-sumer level device, a couple percent error rate I'd
> think wouldn't be seen as too big an error rate. Standard discrete
That'd be completely horrid - several percent might be acceptable in
a $49 converter but part of what the extra money went to was hopefully
better quality conversion.
The point I was trying (and apparently failing) to make was that
the encoder will see things that the eye does not and that the encoder
can end up amplifying that information to where it produces visible
artifacts.
If you're wondering why the contrast isn't what you expected or that
the blacks look muddy or washed out - it could well be a color cast
in addition to the usual noise.
Ok - I'll attach the screen shot showing the "with" and "without"
correction. Came from an old VHS tape and most folks would simply
accept the image as it was since it would look "good enough". After
cleaning it up it's, well, wow - so that's what it should look like! :)
The left side is the original, the right side is after the various
filters were applied. Just a little bit noticeable eh?
> Could some of the "noise" actually be from the laser disk capturing
> some of the film grain?
Could be that - but the frame I was looking at was between selections
on the disk, basically the black after the movie/cartoon had long
ended.
Doesnt' really matter where the "noise" is coming from - it's there,
the eye doesn't really see it but the encoder does and from what I've
seen is one of the causes of the "blocky dark areas' folks mention
fairly often.
Cheers,
Steven Schultz
<<attachment: shot.jpg>>
