Artisan du Numérique

for f in *.jpg; do convert "$f" -resize 1600x900^ -auto-orient -strip +profile "*" "$f" ; done
for f in *.jpg; do convert "$f" -gravity Center  -auto-orient  -strip -size 200x200 -thumbnail 270x270^ -extent 270x270 +profile "*" -set filename:new "%t-thumb" "%[filename:new].jpg" ; done