Software
GIMP
You can install GIMP to fulfill all your image editing needs as follows-
The following instructions assume that you're inside your distro's shell and not using Termux's
shell for this.
Please find your distro and run the command in its shell-
Ubuntu/ Debian based distributions-
sudo apt-get update
sudo apt-get install gimpArch Linux based distributions-
sudo pacman -Syu
pacman -Syu gimpFedora based distributions-
sudo dnf update
sudo dnf install gimp