Proper black and white from analog capture

[Avisynth_challenged]

Hello Doom9 Forum members.

This is my first post, and I hope you'll be nice to the newb :)

I'm working on a project to convert an analog laserdisc source to NTSC DVD. Before I capture, I try to set up my video source to output proper black and white levels for North American NTSC (16-235 luma range).

I do this by capturing a test segment of the laserdisc source that has only black and white in at least 1 frame. I then use Avisynth's Histogram to set the levels properly. Here is an example screenshot:

Histogram from LD capture (http://i64.photobucket.com/albums/h183/partingshot/histogramld.png)

But I notice that on commercial DVD's, the histogram of a similar black/white only frame is much "cleaner" than the analog histogram. Here's an example screenshot from a commercial DVD source:

Histogram from commercial DVD (http://i64.photobucket.com/albums/h183/partingshot/histogramdvd.png)

So my question to the community would be: should I tweak my laserdisc capture to have "clean" black and white like a commercial DVD? If so, what avisynth filters would be best try? I figure that I only need a *slight* adjustment to achieve this goal, so hopefully whatever I use won't change the PQ perceptibly, since it has already been adjusted for proper levels prior to capture.

Thanks in advance for any suggestions.

[Mug Funky]

that's just low-level noise. possibly inter-field phase differences (NTSC colour sucks at that). if you greyscale() the picture you might lose some of that, otherwise just denoise as you would normally.

if you've got a laserdisc of colourbars and a broadcast monitor with a "blue only" mode, and the ability to adjust phase on your LD player you'll be able to minimise it :). that's not particularly helpful though, as i'm sure most people will have none of those things.