Re: [Gimp-user] Does GIMP have automated macro / batch processing?

[Steve Kinney <admin pilobilus net>]

On 04/04/2017 11:54 AM, Steve Kinney wrote:
> You may also find this useful, as you are working with a Linux OS:
>
> https://www.imagemagick.org/Usage/crop/
>
> Imagemagick is a very versatile tool for doing repetitive operations on
> images.  In your use case, it would be possible to run the program
> twice, to save cropped copies of the right half of every image, then
> save copies of the left half of every image.
>
> Determining the exact commands to use takes a little digging in the
> documentation, but that's way easier than learning Scheme (or so I
> imagine, not having learned Scheme myself).
>
> If your scans don't need tweaking, and your target output is a PDF
> document, Imagemagick covers that in one operation:
>
> http://www.binarytides.com/convert-pdf-image-imagemagick-commandline/

Oops, that's how to do the opposite thing:  Convert PDF to image files
with various tweaks.  Here's something more like what I intended:

convert *.jpg [output].pdf

Combining a large number of big images into one PDF file takes a lot of
resources and may even fail if your system is not very powerful.  For
those cases, this little script will do the job:

for f in *.jpg;
do
convert "$f" "${f%.jpg}.pdf"
done
pdftk *.pdf cat output combined.pdf/

(Needs the pdftk "PDF toolkit", available in all the major Linux repos.)

:o)