The dev has talked about wanting to add an image overview feature like sxiv, but hasn't quite found the time yet. Perhaps I'll look into this at some point.

There's also an option to print remaining opened images to stdout upon closing sxiv. This could be used to "select" various images in nnn, first open imv with all the images in your folder or whatever, then press x to close the ones you don't want, and then close imv and use a script to select all these images in nnn. Should be doable.

pixel art

By default imv blurs low resolution images. You can run it with -u nearest_neighbour to fix this.