Install mtpaint by entering the following commands in the terminal:
sudo apt update sudo apt install mtpaint
Description:
painting program to create pixel art and manipulate digital photos
mtPaint is a free, open source graphic editing program which uses the GTK+ toolkit. It is geared towards creating indexed palette images and pixel art. . Due to its efficient design it can run on older PC hardware (e.g. a 200MHz CPU and 32MB of RAM). It can edit indexed palette or 24 bit RGB images and offers basic painting and palette manipulation tools. . It is aimed to be simple and easy to use. it also can handle JPEG, GIF, TIFF, BMP, XPM, and XBM files.
Homepage: http://mtpaint.sourceforge.net/
Version: 3.40-3
Section: universe/graphics