Crop image into perfect square for thumbnail

It is easier for me to explain this by showing you:

if this image is uploaded:

i want a thumbnail to come out like this:

In other words, re size the photo so that the smallest dimension becomes 100% of the square size, and then crop the remainder from the larger dimension so that it in fact becomes a perfect square.

I do this because it is a lot easier to layout a gallery page when the thumbnails are all square.

I will be uploading alot of images, and would rather not do this manually...

Thanks

The way to do this is to first crop the image into a perfect square that is the size of the smallest size, this is set in the javascript, beforeUpload:

function beforeUploadHandler(){
    var count = $au.uploader('Upload1').files().count();
    for (var i=0; i < count; i++) {
        var $file = $au.uploader('Upload1').files().get(i);
		var squareSize;
		if ($file.width() < $file.height()) {
			squareSize = $file.width();
		} else {
			squareSize = $file.height();
		}
		var cropBounds = [0, 0, squareSize, squareSize];
        $file.cropBounds(cropBounds);
    }
}

Then, re size the now square image to the desired thumbnail size with a converter:

	$converter2 = new Converter();
	$converter2->setMode('*.*=Thumbnail');
	$converter2->setThumbnailHeight(125);
	$converter2->setThumbnailWidth(125);
	$converter2->setThumbnailFitMode("Fit");
	$converter2->setThumbnailApplyCrop(true);