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Add to SafariWhen comparing Eye of Gnome (eog) vs nomacs, the Slant community recommends nomacs for most people. In the question“What are the best FOSS image viewers for UNIX-like systems?” nomacs is ranked 2nd while Eye of Gnome (eog) is ranked 9th.
Specs
Question Ranking
Pros
Pro More lightweight than other kde or gnome dependent applications like gwenview, gthumb or kphotoalbum
Pro Double-click to view Fullscreen
By default, double-clicking on the current image opens it in Fullscreen mode. This can be turned off in Preferences if desired
Pro Image Slideshow
You can view a slideshow of all images in the current folder, and adjust the delay between images in the Preferences dialog
Pro ESC key exits Fullscreen and program
Pressing the ESC key exits Fullscreen mode, as well as exits the program ... hence press the ESC key twice and you're out
Pro Can set image as wallpaper
You can set the current image as your desktop wallpaper directly from within this program
Pro Highly customizable
Pro Detailed view of image metadata
Pro Lots of image adjustment tools
Pro Simple and pleasant look
No cramped toolbars or large icons; the UI is cohesive, minimal and keeps out of your way.
Pro Lightweight
Starts very quickly and has a small memory footprint.
Pro You can work with hot keys that can be reassigned as you want them
Pro Frameless view
Pro Allows to cut (frame) images
It is important if you have to work with photos of documents and want to cut off the background on which you made photos.
Pro Flexible thumbnail views
Can display thumbnails in a strip or a zoomable grid as well, also has hotkey for both of these. Opening a folder is one of the main actions on the toolbar!
Pro Cross-platform
Has builds for Windows, Mac and Linux.
Pro Remembers last used folders
Often used folders (e.g., screenshots) can be quickly accessed.
Pro Batch image processing
Has tools for applying conversions etc. to many files at once.
Pro Can print to printer
Unlike most other image viewers.
Pro Supports new image formats out of the box
Such as WebP, AVIF, etc.
Pro Comparing two images
This feature is called Synchronization. With the synchronization it is possible that multiple viewers perform the same action (like panning, zooming, etc.). This feature is useful when comparing two images. See more here.
Cons
Con No APNG support
And it won't be it seems https://bugzilla.gnome.org/show_bug.cgi?id=151281
Con Still have gnome dependencies
Con No support for JPEG-XL
Con Only partial support for HEIC
Apple's HEIC format is only partially supported. Nomacs can open individual images, but can't navigate among them.
Con Heavy compared to other Linux image viewers
Uses more memory and CPU than other lightweight image viewers. High CPU usage when starting.
Con Returns to default settings after update
Con Recent version has slowed down
The latest version (3.8) suddenly became very slow in Fedora 26. Slow to step from image to image; slow to open a directory; slow slow slow. Downgrading to the previous version (3.6) restored speed.
