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The app I used was Acorn and while it has scripting capabilities, it's not documented the best (it's an absolutely fantastic image editor though, I use it all the time). The script was driven by an Automator workflow since Acorn has a pretty severe memory leak when it's being scripted and needed to be killed repeatedly, but the script that did the resizing and composition is probably straightforward to rewrite for GIMP or Photoshop, for those that know how. I've attached the script here. acorn_marquee.js

I think you are right that there is something similar for batch manipulating images with GIMP or via ImageMagik as you demonstrated. Thanks again!

After trying a bunch of options (including the backdrop blur of the marquee itself... it wasn't great), I ended up creating a background based on an image I found searching around for marquee ideas. They had really dark gray arcade manufacturer logos on a black background and it looked... OK. But it looked pretty terrible on the display, not much better than filling with black. And it was created with PotatoShop, it didn't have nearly enough pixels to fill a 1920x360 display nicely. Where I ended up is a bit more colorful: A batch processing script that sized each marquee to maximally fit as much of the space as possible kept the marquee filled with as much of the game art as was reasonable. Sometimes the art was so small I could only size it up a little and just center it. Some art is pretty square so it only covers a little. And then there's Red Baron, which was one of a few big enough to cover the entire display on its own. The company logos are the work of Dan Patrick over on the LaunchBox Forums: https://forums.launchbox-app.com/files/file/3402-v2-platform-logos-professionally-redrawn-official-versions-new-bigbox-defaults/ Also found folks who are creating updated, high-def marquees over there as well: https://forums.launchbox-app.com/files/file/3080-huge-mame-marquee-collection-including-many-in-4k-resolution/ (hope it's OK to link to them) As for my marquee, it's free to use if anyone wants it. It's three times the size of my monitor so it should scale down nicely if need be. And I clearly don't own or claim any of the logos used, so a standard "don't sell the art" disclaimer applies.