Resizing = loss in quality?

[DYEWiTNEZ]

I was wondering the following thing:

When i have a DV AVI file (and i frameserve it to tmpgenc with VirtualDub) and i use cropping (for removing scanlines max 20 pixes each border cut) + a resize filter back to 720x576, will this result in quality loss in contradiction to just leaving out the resize and have it encoded without any (resize/crop) filters?

I know there will be a little difference, but it's so small - is it noticable?

[Tuning]

At this high resolution cutting the border @ 20pel will not affect quality.(un noticable).The quality only get dirty if u go beyond 480pixels width and 272pixels height.[approximate-don't know exactly]

:D - Tuning

[ronnylov]

I would crop 16 pixels on each side and replace with black borders since it is better for the compression to have the border aligned with the 16x16 pixel macroblocks. 20 pixels are not block optimized.

Actually what I do is to crop to 672x544 (24 pixels both sides and 16 at top and bottom) and then add 16 pixel black borders on all sides up to 704x576. This resolution is DVD compliant for PAL and I can't see the black borders at playback on my TV.

You will make it easier to encode and you will improve the quality!

[DYEWiTNEZ]

Good idea, thanks!! :)