ImageMagick Batch Process

Resize Images:

$ mogrify -path path_to_output_folder -resize 'WidthxHeight' *.jpg

Center Crop Images:

$ mogrify -path path_to_output_folder -resize 'Width' -gravity Center -crop\

WidthxHeight+0+0 +repage *.jpg

Compact Sparseimage/bundle

hdiutil compact /path_to/yourimage.sparseimage