Letterpress is a free and open source ASCII art application for Linux. Using Letterpress, you can convert your images into ASCII Art easily. It is based on jp2a and written in Python and released under GNU General Public License v3.0. For the good result, always select high contrast, vibrant color, defined edge recognizable shapes. In this all you adjust character width, clipboard copy support and export your output in txt file.
How to Install Letterpress on Ubuntu
Letterpress is available as a flatpak package file from the remote flathub app store. First install flatpak and flathub on your system and restart it after the installation.
sudo apt install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
Now in the terminal application run below Letterpress flatpak install command.
flatpak install flathub io.gitlab.gregorni.Letterpress
After that, run below command in the terminal app to open it or you can also open via the Show Apps Ubuntu dock menu.
flatpak run io.gitlab.gregorni.Letterpress
And uninstall it using below commands.
flatpak uninstall io.gitlab.gregorni.Letterpress
sudo flatpak uninstall io.gitlab.gregorni.Letterpress