Batch processing images to be proportional

Question

I have a series of small images, all on white backgrounds.

Some of them are square proportioned, others are rectangular proportioned; either vertically or horizontally. I'm looking to make all all of the images square, the size doesn't matter but the proportion does.

Is there a quick way to batch process all images so that it turns rectangular images into squared images while keeping them centered and also ignoring images that are already square?

I'd try a macro or script, but I don't know how to code something like: "make the image and bigger at its biggest side".

I'm working with Photoshop but I can upload the images to any online tool if needed.

Answer 1

I won't go into detail about the batch process. It should be enough to know that you can run a script through the File > Automate > Batch... by first making a Photoshop Action, where you open a script file: File > Scripts > Browse.... Obviously you can also do more things within that same Action.

I'm not exactly confident I understand what you want, so I'm posting 2 scripts. Make a new .jsx file where you paste one of these scripts and use that in the action.

These both work with portrait and landscape images.

Image to square - Shrink script.jsx:

var rUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;

var doc = app.activeDocument;
var docWidth = doc.width;
var docHeight = doc.height;
var newSize = docWidth > docHeight ? docHeight : docWidth;

app.activeDocument.resizeCanvas( newSize, newSize, AnchorPosition.MIDDLECENTER );

app.preferences.rulerUnits = rUnits;

---

Image to square - Grow script.jsx:

The extended background color comes from the background color set in the toolbar.

var rUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;

var doc = app.activeDocument;
var docWidth = doc.width;
var docHeight = doc.height;
var newSize = docWidth > docHeight ? docWidth : docHeight;

app.activeDocument.resizeCanvas( newSize, newSize, AnchorPosition.MIDDLECENTER );

app.preferences.rulerUnits = rUnits;