Making 'Polaroid' Images

For a new game I needed 70+ 'polaroid' style images, but I only had regular (square) jpg images. I could think of several ways of achieving this:

Manually
An online tool
Make a tool for myself

Manually

I could painstakingly manipulate each of the 70+ images;

Open the image in a paint application (eg Gimp)
Resize the image
Increase the canvas size to provide space for the 'polaroid' effect
Reposition the actual image within the new canvas (I wasn't sure this was auto-achievable during the canvas resizing)
Colour the background white
Save as...

This would work, of course, but...yawn...and I'd probably make mistakes along the way

An online tool

A quick search found several tools, some free, some paid-for.

I didn't want to pay for something, especially as I was going to give away the results.

And, I'm always wary of free online tools...

Are they secretly copying all my data/images for their own use?
Are they harvesting my IP address/cookies etc for their own nefarious use
Are they installing some horrid virus or keyboard logger?
They're usually slow...all that upload|wait|download, malarky.

Make a tool for myself

I use an Apple MacBook. It has some amazing hidden powers - well, not hidden, but certainly not commonly used. So donning my explorer's pith helmet I prepared to explore...

First, the Results

I created a tool that;

Is totally free
Uses features built into my MacBook
- Prompts me to select one or more original images from a folder
- Duplicated and processed each image
- Saved the results to a new folder
Is fast! It took, ooh I don't know, a second or two, to process 70+ files
See examples at the top of this post (used in a webpage and randomly rotated using Javascript)
One example shown here for easy examination...

Looks pretty good to me!

How to create the tool?

Let's cut to the chase...

Open "Automator" (the icon looks like a little robot, and he lives in your Applications folder (or look in Launchpad/Other...)
We'll add just 4 steps:

Ask for Finder items
From your original image folder. Allow multiple items
Copy Finder items
To your destination folder. Allow to replace existing files (so you can run it several times if needed).
Scale images
I was starting with square images from Leonardo, 1120px x 1120px, so I scaled to 335px square
Run Applescript
This is the slightly tricky and technical part. Here's the script I used, with sizes chosen for my needs, you may need to adjust the sizes to suit.

on run {input, parameters}

repeat with this_file in input

set this_path to the quoted form of the POSIX path of this_file

do shell script "sips " & this_path & " -p 455 375 --padColor FFFFFF -I"

do shell script "sips " & this_path & " -c 415 375 --cropOffset 40 1 -I"

end repeat

return input

end run

Things to beware

You can uncomment that "display dialog" line to see if the path is as expected
For the "do shell script" commands, ensure there are spaces around the quoted-path (ie after 'sips ' and before ' -p/c...'
Padding adds space evenly around the original image, hence the need to follow-up with a 'crop' command.
To get the polaroid shape, we want to discard most of the top padding, hence we start the crop (using 'offset') at 40px
If required, you could add a dark border by repeating the pad/crop with a dark background
Weirdly, the x crop-offset must be > 0 (hence I used 1) else you get no change to the image.

That's all !

I hope this helps someone else out.