• You should M-x customize RET and look for "mailcap mime".
• Navigate to "Mailcap User Mime Data".
• INS new entry.
• Clock in Choice:Value Menu and choose Shell command.
• type in Choice Shell command: sxiv %s
• type in MIME Type: image/*

Save the customization. Now, when jupyter looks for how to visualize an image file it will use sxiv. As the procedure we would like to emulate is upon a string-directory, the format is sxiv %s(tring). Just like we would type in a terminal to visualize an image with sxiv, e.g., sxiv ~/path/to/my/image. The path is provided by a temporary file created by jupyter as the output of the cell.

I hope it's clear.

ALTERNATIVE (tested): in $HOME/.mailcap file, put the following text and save it:

image/*; magick display %s

In Emacs, M-x customize RET, look for ein inline images, and Toggle to on (non-nil) the Ein Output Area Inlined Images: area.

Ein Output Area Inlined Images: Toggle  on (non-nil)
    State : SET for current session only.
   Turn on to insert images into buffer.  Default spawns external viewer.
Groups: Ein

If you have imagemagick installed (an image viewer and manipulator), you should be able to go to an ein-jupyter session, in a jupyter notebook, and see images inlined:

• You should M-x customize RET and look for "mailcap mime".
• Navigate to "Mailcap User Mime Data".
• INS new entry.
• Clock in Choice:Value Menu and choose Shell command.
• type in Choice Shell command: sxiv %s
• type in MIME Type: image/*

Save the customization. Now, when jupyter looks for how to visualize an image file it will use sxiv. As the procedure we would like to emulate is upon a string-directory, the format is sxiv %s(tring). Just like we would type in a terminal to visualize an image with sxiv, e.g., sxiv ~/path/to/my/image. The path is provided by a temporary file created by jupyter as the output of the cell.

I hope it's clear.

ALTERNATIVE (tested): in $HOME/.mailcap file, put the following text and save it:

image/*; magick display %s

In Emacs, M-x customize RET, look for ein inline images, and Toggle to on (non-nil) the Ein Output Area Inlined Images: area.

Ein Output Area Inlined Images: Toggle  on (non-nil)
    State : SET for current session only.
   Turn on to insert images into buffer.  Default spawns external viewer.
Groups: Ein

If you have imagemagick installed (an image viewer and manipulator), you should be able to go to an ein-jupyter session, in a jupyter notebook, and see images inlined:

EDIT: include author MWE Your example works fine here, after this setup.

NOTES:

• You can use whatever image viewer software you would like, sxiv,imagemagick, gimp, etc.

• You should M-x customize RET and look for "mailcap mime".
• Navigate to "Mailcap User Mime Data".
• INS new entry.
• Clock in Choice:Value Menu and choose Shell command.
• type in Choice Shell command: sxiv %s
• type in MIME Type: image/*

Save the customization. Now, when jupyter looks for how to visualize an image file it will use sxiv. As the procedure we would like to emulate is upon a string-directory, the format is sxiv %s(tring). Just like we would type in a terminal to visualize an image with sxiv, e.g., sxiv ~/path/to/my/image. The path is provided by a temporary file created by jupyter as the output of the cell.

I hope it's clear.

• You should M-x customize RET and look for "mailcap mime".
• Navigate to "Mailcap User Mime Data".
• INS new entry.
• Clock in Choice:Value Menu and choose Shell command.
• type in Choice Shell command: sxiv %s
• type in MIME Type: image/*

Save the customization. Now, when jupyter looks for how to visualize an image file it will use sxiv. As the procedure we would like to emulate is upon a string-directory, the format is sxiv %s(tring). Just like we would type in a terminal to visualize an image with sxiv, e.g., sxiv ~/path/to/my/image. The path is provided by a temporary file created by jupyter as the output of the cell.

I hope it's clear.

ALTERNATIVE (tested): in $HOME/.mailcap file, put the following text and save it:

image/*; magick display %s

In Emacs, M-x customize RET, look for ein inline images, and Toggle to on (non-nil) the Ein Output Area Inlined Images: area.

Ein Output Area Inlined Images: Toggle  on (non-nil)
    State : SET for current session only.
   Turn on to insert images into buffer.  Default spawns external viewer.
Groups: Ein

If you have imagemagick installed (an image viewer and manipulator), you should be able to go to an ein-jupyter session, in a jupyter notebook, and see images inlined: