Install apngasm by entering the following commands in the terminal:
sudo apt update sudo apt install apngasm
assemble APNG animation from PNG/TGA image sequence
Tools to create APNG file from individual PNG files with user given delay. . The Animated Portable Network Graphics (APNG) file format is an extension to the Portable Network Graphics (PNG) specification. It allows for animated PNG files that work similarly to animated GIF files, while retaining backward compatibility with non-animated PNG files and adding support for 8-bit transparency and 24-bit images.