Advice on Resizing

D-Dave · 14th April 2012, 01:25

Lanczos, Lanczos4, Spline 16/36/64, nnedi3, etc. I’m in search of the overall best resizer for downscaling and the overall best resizer for upscaling. In the past I have been using spline 36 as I heard favorable things about the resizer, however, I have this feeling that spline 36 is not the ultimate answer to resizing. After reading “Upscaling in Avisynth – Comparision of resizers,” I felt incline to ask the community what I should use when downscaling and when I’m upscaling.

The writer of the article linked above, Jean, rated the resizers as so: nnedi3 > lanczos/lanczos4 > spline36 > everything else (slightly different than what I’ve read from other individuals). Would anyone agree that for general upscaling nnedi3 should be used before lanczos/4 and so forth? If not, what would be the best resizer for general upscaling? Are there any typical situations where one resizer will perform noticeably better than the “best” general upscaling resizer (if so explain)? Side note, when explaining a resizer, could you provide an example or two on how to execute it for reference on how to implement it into one’s script (I’m not sure how to use nnedi3 as a resize).

As for downscaling video, would the resizer used in upscaling also be the best for downscaling or is there a resizer that is more appropriate? Are there any typical situations where one resizer will perform noticeably better than the “best” general downscaling resizer (if so explain)? If its dire to know what I will be using the resizers for in order to make a recommendation, I plan on downscaling 1080i footage to 1280 by 720 as well as upscaling 480i footage to 1280 by 720 (all interlaced footage will be deinterlaced beforehand with QTGMC). In some cases I will upscale the 1080i footage from 1440x1080 to 1920x1080 and in other cases 480i to 1920x1080 (or a 4:3 aspect ratio for 1080).

Bonus question: Has anyone looked into the super resolution that is offered in vReveal? I’ve had the program since version 1.1 and I was curious how the super resolution performs in upscaling video in comparison to what Avisynth has to offer. I will probably run my own tests in my free time, but if anyone already has information and experience with vReveal’s super resolution feel free to post.

14th April 2012, 01:25	#1 \| Link
D-Dave Registered User Join Date: Mar 2011 Posts: 8	Advice on Resizing Lanczos, Lanczos4, Spline 16/36/64, nnedi3, etc. I’m in search of the overall best resizer for downscaling and the overall best resizer for upscaling. In the past I have been using spline 36 as I heard favorable things about the resizer, however, I have this feeling that spline 36 is not the ultimate answer to resizing. After reading “Upscaling in Avisynth – Comparision of resizers,” I felt incline to ask the community what I should use when downscaling and when I’m upscaling. The writer of the article linked above, Jean, rated the resizers as so: nnedi3 > lanczos/lanczos4 > spline36 > everything else (slightly different than what I’ve read from other individuals). Would anyone agree that for general upscaling nnedi3 should be used before lanczos/4 and so forth? If not, what would be the best resizer for general upscaling? Are there any typical situations where one resizer will perform noticeably better than the “best” general upscaling resizer (if so explain)? Side note, when explaining a resizer, could you provide an example or two on how to execute it for reference on how to implement it into one’s script (I’m not sure how to use nnedi3 as a resize). As for downscaling video, would the resizer used in upscaling also be the best for downscaling or is there a resizer that is more appropriate? Are there any typical situations where one resizer will perform noticeably better than the “best” general downscaling resizer (if so explain)? If its dire to know what I will be using the resizers for in order to make a recommendation, I plan on downscaling 1080i footage to 1280 by 720 as well as upscaling 480i footage to 1280 by 720 (all interlaced footage will be deinterlaced beforehand with QTGMC). In some cases I will upscale the 1080i footage from 1440x1080 to 1920x1080 and in other cases 480i to 1920x1080 (or a 4:3 aspect ratio for 1080). Bonus question: Has anyone looked into the super resolution that is offered in vReveal? I’ve had the program since version 1.1 and I was curious how the super resolution performs in upscaling video in comparison to what Avisynth has to offer. I will probably run my own tests in my free time, but if anyone already has information and experience with vReveal’s super resolution feel free to post.