Still pic

prairiedogpics wrote on 6/1/2004, 7:34 AM
This is a little hard to explain...maybe nothing is wrong, but I'm curious what may cause this...

I've got a still image on one track. An image of my son, cut out against a transparent background.
On the track beneath that, I've got a still image of a mountain range. So my son is "floating" on top of the mountain range. No movement has been set up, no pan/crop. As some point the mountain range image intentionally ends, causing you to see my son against a black background.
Here's the weird thing:
I burn this to a DVD and play it on my TV. At the instant the background image (mountains) disappears, meaning the background goes black, my son's still image shifts slightly to the left.
This doesn't happen when I play the DVD on my PC, or when I play the timeline, or any other time. Only with the DVD viewed on the TV.

It's almost like the picture tube "blooms" the mountain range image, and then when that disappears, the whole image shrinks a fraction, causing my son's image to move. My TV has been "calibrated" with the Video Essentials DVD, and otherwise looks fantastic. This happens on another TV, as well.

Is that possible? Everything looks good on the timeline and and on the PC.

Dan

Comments

VegasVidKid wrote on 6/1/2004, 8:34 AM
Just a wild guess, but maybe the black background is "too black", i.e., beyond the standard broadcast range which is causing the image to freak out on the TV. You may need to knock it down a bit, although, I've never done this myself.
Jsnkc wrote on 6/1/2004, 8:38 AM
"You may need to knock it down a bit,"

Actually if the black is out of legal limits you will have to knock it UP a bit :)
prairiedogpics wrote on 6/1/2004, 8:59 AM
Ah, you may be right. I'll throw a "broadcast clamp" on it and see what happens. I hadn't thought of that.

Thanks,
Dan
Chienworks wrote on 6/1/2004, 10:00 AM
Even with broadcast legal stuff i've seen this happen. Create a little video with a picture on the right half of the screen and some strong contrast dot that glides up and down the left side. You'll see the image "pucker" and sway as the dot moves up and down. If you look closely enough you might even see this on a CRT computer monitor too. I would imagine that LCD is immune to this, but i haven't had a chance to try it yet.

Here's a 39KB Vegas 4.0d .veg file with media that you can use to illustrate it for yourself:

http://www.vegasusers.com/testbench/veggies/chienworks-luma-bounce.zip