When comparing GPicView vs Gwenview, the Slant community recommends Gwenview for most people. In the question“What are the best FOSS image viewers for UNIX-like systems?” Gwenview is ranked 11th while GPicView is ranked 13th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multiple windows
When opening multiple images at once it opens every single picture in a separate window.
Pro Functional
It has all the necessary functions that you can reasonably expect from a lightweight image viewer: you can view all the image files in a directory, rotate and save them.
Pro Customizable
Pro Extremely lightweight
And still you can browse all images in a directory.
Pro Easy to navigate folders
Pro Quickly view image metadata
Pro Easily resize, crop, flip and rotate
Pro Keyboard shortcuts can be redefined
Pro Images can be sorted by name, date and size
Cons
Con Has a bug that causes certain png files to show brighter than normal
The image, if is a png that contains gamma information, will appear washed out. There is still an open ticket concerning this issue.
Con Very slow on remote folders
Compared to others, like XNview, is VERY slow when retrieving images from shared folders (NFS or Samba).
Con Not lightweight
Needs a lot of KDE packages.