On 11/15/2012 09:48 PM, rmooney wrote:
I enjoy using GIMP, but I'm looking for some help to cut down on my time
watermarking my photos. Currently I am opening a photo, adding text, rotating
text, duplicating the text layer, then moving each layer to the top left and
bottom right corners. Surely there must be a way to make this process quicker?
Any help will be appreciated.

A few years ago I was using Imagemagick for similar watermarking in an automated batch process. However, at that time there were some bugs (at least on our system) that prevented me from getting exactly what I wanted in terms of text appearance. However, it was _supposed_ to work and seemed to for other people. I suspect it does now (if not then also) and would work now on our more modern o/s.


When I was using it, it was part of a larger process I ran: making multiple scaled JPEGs from single TIFFs, and applying the watermark, all in the same process (without messing up the TIFFs).

We still use Imagemagick for the sizing/scaling to process thousands of images. We use a Perl script wrapper to manage the process of running through hundreds of source directories/folders containing tens of thousands of images, processing only those that are newer in the source than the target, and pushing the results to a matching output directory/folder structure. (Thus any changed image will get reprocessed.) We use a complicated algorithm in the Perl script to decided the min / max size for each output, with max limitations on width and/or height (but maintaining original scale), based on the four target uses and on the physical size of the input object TIFFs (the TIFFs are all scanned at 100% of size (said from a printing perspective) at 300 dpi. The original source objects range from 1x1 inch to 20x20 inches (flatbed scans). The output sizes need to be "sane" to fit in a web page that is "sane" and yet takes advantage of whatever size is available without making the page too wide. The logic and math of this hurts my head; among other things, the differences input and output dpi really warps the math, while you are scaling differently depending upon various rules.

Anyway, it works great and runs like cat with a bell tied to its tail. (I'm a cat person, but that would be fun.) The more RAM and the more processors the better and if you can control (increase) the number of simultaneous processes on your machine, you can make it scream.

If we were to go back to watermarking, of course the watermark needs to be applied _after_ the sizing/scaling, but before saving the JPEG.

You could also set up a "watched folder" type of system into which you could drop the source images and have a 'cron' job that checks and processes the folder however often you want.

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