will crop and resize lose too much video quality?

[kopmjj]

i have an 720,480 avi file in lossless lags format and i want to crop the bottom and right by 10 pixels each and then resize back to 720,480 but i was wondering before i do that will i lose quality if encoded back to lossless?

i want to crop because the video has loads of vhs noise etc on the bottom and on the right has a black bar inside the video which i need to get rid off.

so any suggestions welcome thanks.

[poisondeathray]

There will be no additional compression losses if you use lossless format like lagarith. The only losses you incur will be from the upscaling and cropping. So in a sense you can define it as a quality loss (because it's deviation from the original) , but on the other hand you might say it's a quality improvement.

[lordsmurf]

You can't do that on interlaced material.

Mask it, don't crop it.

[kopmjj]

You can't do that on interlaced material.

Mask it, don't crop it.

its deinterlaced source and how do you mean mask it?

[manono]

He means cover it with black, rather than cropping it away and resizing.

[creamyhorror]

There will be no additional compression losses if you use lossless format like lagarith. The only losses you incur will be from the upscaling and cropping. So in a sense you can define it as a quality loss (because it's deviation from the original) , but on the other hand you might say it's a quality improvement.

If you're going to display the video at something other than 720x480, then it's certainly a quality loss. Cropping without resizing involves only 1 (quality-reducing) resize operation (namely during playback), while resizing to 720x480 involves 2. The difference might be close to negligible but it's still a loss.