Upscale image in linux

[gist31]

Hi, I found this project and took a look at it. Since I didn't find a .deb file, I decided to see if I needed Video2x using my Windows partition that I rarely use (I use an Ubuntu distro). Then, since it looked like something that I would use, I decided to try to install it on linux. It was very difficult (mainly because I'm dumb, because in the end it was easy), but I managed to use it using docker. I have an AMD gpu and every time I use the following command to upscale a video (the same command as in the wiki):

sudo docker run -it --rm --device=/dev/dri -v $PWD:/host ghcr.io/k4yt3x/video2x:5.0.0-beta6 -i Desktop/edit.mp4 -o Desktop/edit-output.mp4 -p3 upscale -h 2160 -a waifu2x -n3

My only problem is that when I used Video2x in Windows, I was able to also upscale images, and not only videos. Since I can't find anything in the wiki, I don't know what the command is to do so, and simply changing the input and output files doesn't work.

Any help is appreciated, thanks