Convert .tiff images to .jpg:
convert *.tiff -set filename: "%t" %[filename:].jpg
Resize images:
mogrify -auto-orient -resize 1000x1500 *.jpg
Compress images:
mogrify -strip -interlace Plane -quality 75% *.jpg
Resize images to 150 height:
mogrify -auto-orient -resize x150 *.jpg