I want to be able to bulk process some images by any OSS tool The images are filled forms photographed on both sides, and get processed rather poorly by my printer. What I want to do is:
1. Rotate by 90 degrees
2. Ideally, trim off the darker outer border.
3. Increase brightness - 40% worked for my test sample, but I can adjust the exact number for each batch.
4. Increase contrast - 55% worked for my test sample. The figures will be different on the batch, but they will be constant.
5. Save elsewhere.
6. Print them dual sided. I don't really expect to automate this.

There could be up to 150 of these to do. Any scripting for gimp or ImageMagick seems to mean learning a new language, which takes as long as doing it by hand.

Any suggestions?

Have a look at ImageMagick which is a command line image processor, if it can be done to an image, imagemagick can do probably do it.

eg:

i care to disagree.
take a look at http://www.imagemagick.org/script/co...ne-options.php and hack yourself what you need. i don't see any faster way.
then you just wrap it in a shell script like this:done. i don't see any faster way.

Well, it took more time than I wanted to give it, but it is sorted.

Warning to others: ImageMagick-6.x is different from most of the guides out online done for previous versions. Try the installed documentation first. I tried it last :-/.