gif

convert -size 1080x1080 -delay 20 -dispose previous -loop 0 -layers Optimize -transparent *.png 000.gif

colorize

convert -size 1080x1080 -delay 20 -dispose previous -loop 0 -layers Optimize -fill blue -colorize 0,0,50 -transparent *.png 000-col.gif

Reference:

https://imagemagick.org/script/command-line-options.php#background

https://legacy.imagemagick.org/Usage/anim_opt/

https://legacy.imagemagick.org/Usage/quantize/#colors

https://legacy.imagemagick.org/Usage/anim_basics/#gif_anim

https://imagemagick.org/script/command-line-options.php#colorize

https://webinista.com/updates/how-to-create-animated-gifs-imagemagick/

http://shebangthedolphins.net/gnulinux_ultimate_gif_tutorial.html