Image resize

Image batch resize
From Linux Format 235:

Batch resize folder:
mogrify -path . -resize 70%70 -quality 75 -format jpg *.png
mogrify -resize 70%70 -quality 75 *.jpg

Duplicate delete:

fdupes
findimagedupes - github

./findimagedupes -R ~/Pictures
find from sub directories

guezli - high quality jpeg