In my tests I found a better workflow to get best results:

record 720p50 or 720p60 in GH2, use sharpness -1

create a project with cuda acceleration

create a 1080p timeline with desired frame rate

import the 720p clip and interpret footage to the desired frame rate

put the 720p clip in 1080p timeline, keep sequence settings

apply the gpuresize effect

set resolution to custom 1920 x 1080

set interpolation method to "kaiser"

enable "stairstep" option

render the footage to 1920x1080, take long time...

import the rendered 1080p upscaled footage

put it in a 1080p timeline

apply unsharp mask effect and set it to: 100 - 0,3 - 0

render the footage

now the GH2 720p will look like it was recorded in 1080p

This method can also be used to upscale 1080p to 4k.

In my tests with G7 footage, the Gpuresize effects settings are the same, the unsharp mask changes to: 70 - 0,3 - 1

My tests was done with:

GH2 footage: 720p to 1080p (I liked it, looks like was shot in 1080p)

G7 footage: 1080p to 4k (blurry results, without aliasing, but blurry, very different compared to native 4k, only worth if you need slow motion overcrank, because GH4 and G7 do not have 4k60p)

I did not test 720p to 4k, but I think it does not worth the effort.

Perceived resolution is a mix of Acutance and Resolution.

The 720p video from GH2 has enough resolution to satisfy the eyes, but it also has an undesirable amount of aliasing mainly in vertical direction. When doing the upscale, the GpuResize plugin with the Kaiser method and the stairstep fix can reconstruct the image and remove the aliasing making the image agreable to the eyes.

After the upscaling the 720p video looks good, but it is soft because the acutance is low, so the unsharp mask effect corrects this making the acutance enough to increase the perceived resolution.

This way the 720p video from GH2 can be intercut with 1080p video in timeline without significant resolution difference.

http://www.cambridgeincolour.com/tutorials/sharpness.htm

https://en.wikipedia.org/wiki/Acutance

https://en.wikipedia.org/wiki/Unsharp_masking

Respecting a view distance of 2x the screen width or more makes the image looking pretty good to enjoy the content, not just due to the perceived resolution, but also due to be a distance which makes the total screen image perception less invasive and more agreable.

I have gh1, gh2, gh4; been follow up your posts. Your continous works make this forum one of the best, i would say -;)

I did some try in the Lanczos and compared to Kaiser. Kaiser is much better in terms of removing aliasing, and the unsharp mask after kaiser+stairstep works better than lanczos.

It would be great idea if you implement a unsharp mask post effect in the GpuResize, with the three sliders: amount, radius, threshold. Unsharp Mask is much better than simple Sharpen effect because it has less introduction of aliasing.

Do you notice a single pixel green line on the sides when you use this ?

1080p to 4k upscale

I get a single pixel width empty column. Otherwise the conversion is clean.

https://www.dropbox.com/s/jm0jsk0z4uvejx4/Screen Shot 2017-03-20 at 3.40.56 PM.png?dl=0

You can see the green line on the right side.

Got an idea: try to type the size: 3840 and 2160 values in custom mode instead of choose values.

Also experiment the aspect ratio settings.

I found a way to avoid the need of unsharp mask after gpuresize.

Shot 720p with GH2 with sharp -1 in camera.

Before apply gpu resize, denoise the footage with neatvideo and use sharpening in 10% only in luminance, with prevent oversharpening enabled. Then render to 720p.

Then do the upscale with gpuresize to 1080p with kaiser and stairstep enabled and render to 1080p.

Footage will be ok.

I did this with 720p60 iso 2000 from GH2 and works pretty good. (Using last The End NR4 patch from GH2 bundle).

Disabling mercury engine and using software only can help to avoid system crash when using GPUResize.