Warning: I wrote this blog post in 2011. That is a long time ago, especially on the internet. My opinions may have changed since then. Technological progress may have made this information completely obsolete. Proceed with caution.
If anyone is using ImageSizer, my unimaginatively-named multi-monitor image resizing and cropping tool, I’ve made some minor-but-long-overdue updates. Namely, it can operate on a list of input files, instead of just one. And the list of input files can be anywhere in the parameter list. So you can do something convenient like this:
java -jar ImageSizer.jar -monitorWidth 1024 -height 768 *.jpg
The source is also included in the jar file, if you are interested. And if you don’t know what ImageSizer is, I wrote a pretty extensive description with the initial release, which should answer all your questions.