When comparing XnView vs GPicView, the Slant community recommends XnView for most people. In the question“What are the best FOSS image viewers for Linux?” XnView is ranked 4th while GPicView is ranked 12th.
Ranked in these QuestionsQuestion Ranking
Pro Supports over 500 image formats
Pro Includes simple editing tools
Typical image editing tools are included. For instance, there are tools for color and size manipulation, several filters and effects.
Pro Available for macOS, Linux and Windows
Pro Easy redate and view configuration
Pro Compare images side-by-side
To delete blurry phone pics, etc.
XnView speaks over 30 languages.
Pro Portable version for Windows available
Pro Multiple windows
When opening multiple images at once it opens every single picture in a separate window.
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 Extremely lightweight
And still you can browse all images in a directory.
Con No Dark mode
Con Very poor quality and very invazive on windows 10
Convert all images to 8bit rgb
[not suport 16bit or 32bit, cmyk, Lab, multichannel] so you never be able to see real original image, you only see the result of conversion...on windows 10 it enforced self promotion to default app for every type/format of image...
Con No custom installation - if you need i.e. a language package, you need to install the full version
Con Free only for private use
For use in a company 1 license starts at 26 EUR.
Con Doesn't show movies on phone in correct position
Some of mp4 files shows in upside down position.