ImageMagick needs to be installed
This magicks all those formats to png, leaving copy of original photo.
mogrify -format png *.jpg
mogrify -format png *.jpeg
mogrify -format png *.bmp
magick WITH BIGGER QUALITY (default 92)
magick wallpaper.png -quality 100 wallpaper.jpg
RESIZE IMAGE - preserve aspect ratio
magick example.png -resize 1920x1080 example.png
RESIZE IMAGE - ignore aspect ratio
magick wallpaper.png -resize 1920x1080! wallpaper.png
ROTATE AN IMAGE by 90 degrees
magick wallpaper.jpg -rotate 90 wallpaper-rotated.jpg
MULTIPLE ROTATE
for file in *.png; do magick $file -rotate 90 rotated-$file; done