Sorry, is very dificult, show in a video.
Can you acces a old crt tv?
If you can, and have wii, can check a big changes in the image.
In lcd screen, not have this diferences, because the lcd panel change resolution to his native.
Thanks four your job.
Now, for downscale mi xbox, i use a uvc ultracade. This use a 480p vga resolution and insert a black scanline into image in par lines. But only work at 320x240 (640x480/2).
You can see this in this link, make by fudoh, american guru of this transcodes and downcalers
You can see diferences in this cuality pictures.