qView

I used to use Xee for viewing folders of images on macOS, but since they moved up in version numbers, they've begun charging for their software... I set about trying to find a replacement that was minimal, would open images maximized to the edges of the screen but not in full-screen mode, and could scroll through ALL THE IMAGES in a folder. Really Apple, how hard is that!?

qView works amazingly well, and it definitely doesn't hurt that it's free and open source! Big thanks to the developer for making my life a little easier. :)

Scroll to zoom works. On trackpad you can reduce the zoom percentage to suit. Next and Previous image with left/right arrow. Perfect

there are No mouse actions. this makes a decent looking viewer less useful.

Simple viewer, but if I can't use Ctrl Scroll for zooming in/out, I won't keep it.. Consider Honeyview.. much more powerful and believed lighter and faster.

Can't get it to run on Catalina (10.15).

[EDIT:] Never mind; it worked after I updated some other software.

I recommend other Qt-based image viewer qimgv. It has the advantages of this and includes more features.

First impression is positive.

One thing that needs to be improved: when you rotate pages (easily with shortcuts) it rotates all the images in the particular folder. E.g. Folder 1 has 10 pictures in it. You can open the first and then switch left and right between them. Should one of the pictures be landscape instead of portrait you can rotate that by top and down keys. The unlucky effect is that the next picture that all the pictures in the series (same folder) are now rotated as well.

The other thing to wish for, related to the first, is to be able to save the rotation, so that next time I open the picture or switch back to it would need no such editing anymore. Maybe beyond the scope of a "picture viewer" though.

Maybe an additional thing (and it goes against minimalism, but make it toggleable) is there is no toolbar for the possible operations on the picture.