External image viewer

[Disonantemus]

Useful 4 many case scenarios:

• GUI viewer (X11 or Wayland): nsxiv, imv, feh, imagemagick's display, etc
• Terminal emulator (ANSI colored blocks, ASCII): aalib, libcaca, viu, chafa, timg, etc. Some work in TTY. Some use terminal features like: Sixel, or has own solutions like: Kitty, Iterm. It could be possible to open image in a new multiplexer (tmux, screen) tab/window|pane.
• TTY: Framebuffer viewers (near GUI viewers with pure terminal): fim, fbi, fbvis, jfbview, etc.

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Can be done with:

• Shell Variable like nnn.
• CLI option parameter.
• Config or ini file inside ~/.config folder.