drush image-flush
Flush all derived images for a given style.
Drush Command
drush image-flush
Arguments
style : An image style machine name. If not provided, user may choose from a list of names.
Aliases
drush if
Options
--all : Flush all derived images
Examples
Pick an image style and then delete its images.
drush image-flush
drush image-flush thumbnail
drush image-flush --all