When comparing XnView vs pqiv, the Slant community recommends XnView for most people. In the question“What are the best small and lightweight image viewers for UNIX-like systems?” XnView is ranked 7th while pqiv is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Multi-lingual
XnView speaks over 30 languages.
Pro Portable version for Windows available
Pro Configuration via command line flags or configuration file
Configuration based on one file (~/.config/pqivrc).
See manual page:
"
[options]
fullscreen=1
sort=1
command-1=|convert - -blur 20 -
...
[keybindings]
q { goto_file_relative(-1); }
w { goto_file_relative(1); }
Similarly, you can also specify (multiple) actions to be executed each time pqiv is started in a section called [actions].
"
Pro Has a jump mode in thumbnail mode (montage mode) thats similar to vim-easymotion
See "montage_mode_follow(KEYS)" in the man page.
By default g activates jump mode.
Pro Can pipe images through external filters
Pro VIM-like key sequences, action cycling and binding multiple actions to a single key
Pro Keys are easily configured to a user command.
Keys can even be configured on the command line.
Pro Powerful collection of so called actions
Actions can be used to configure the interaction with the program (e.g. moving, file selection, view manipulation, UI appearance, simple image manipulation).
Actions can easily be used in the configuration.
Pro Rudimentary viewing manipulation
h/v: Flip the image horizontally or vertically.
k/l: Rotate the image right or left.
Plus/Minus: Zoom.
Pro Comes with transparency support
Pro Can watch files and directories for changes
Pro Quick jump dialog based on filename mask
j: Show a dialog with a list of all files for quick selection.
Pro Has infobox out of the box
Cons
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 Dark mode
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.
Con Doesn't pan/zoom fluidly with touchscreen
Con Browsing a directory after opening a single file needs user intervention
Con Slow display
Going through a list of images is not as fast as e.g. with sxiv.
Con No selection of (multiple) files
Thumbnail mode hasn't any means of marking files.
Con Thumbnail creation extremely slow
Thumbnail mode is called "montage mode" (key m).