Looping

vipsthumbnail can process many images in one command. For example:

$ vipsthumbnail *.jpg

will make a thumbnail for every jpeg in the current directory.  See the Output directory section below to see how to change where thumbnails are written.

vipsthumbnail will process images one after the other. You can get a good speedup by running several vipsthumbnails in parallel, depending on how much load you want to put on your system. For example:

$ parallel vipsthumbnail ::: *.jpg