Reply To: Exact size Image frame dimensions script

Correct, just something to started on the UI. From there, it would be a matter of resizing the rectangles and their containing images.

app.selection returns an array of all the selected objects on a page. If you select a frame with your black arrow tool, that’s a rectangle object. With one object selected:

var rect = app.selection[0];
var containingImage = rect.graphics[0];

You can look at the rect.geometricBounds property, as well as rect.resize() and rect.fit() methods. Lots of different ways to skin the cat based on your ultimate needs and how your doc is set up.

For some guidance on the Rectangle object, https://www.indesignjs.de/extendscriptAPI/indesign-latest/#Rectangle.html