Quality seem to have no effect

[SDCRoman]

Croping images works great, but I have an issue with the quality.

For example. I need to crop a pretty big image, but the preview has to be small, so I use exportZoom. But the exported version, eventhough is a bit smaller has aweful quality. By aweful quality I mean that the size is very big. The image itself looks great.

The initial image which I select is 2000 x 600 px and 107KB. I crop it to 500 x 100 and use an exportZoom of 4. The resulted image is 2000 x 400, but 720KB. I assumed I need to use quality, but it does not change the result. It doesnt matter which value I assign to quality the result is always 720KB.

Here is the full code:

$('#image-cropper-profile-header').cropit({
		allowDragNDrop: false,
		exportZoom: 4,
		smallImage: 'allow',
		maxZoom: 1, // higher than 1 means loss of quality
		quality: 0.5
	});

	$(".cropit-image-input").change(function() {
		$(".cropit-preview").css("display", "inherit");
		$("#image-cropper-profile-header input[type='range']").css("display", "inherit");
		$("#image-cropper-profile-header button").css("display", "inherit");		
	});

	// Exporting cropped image
	$('#image-cropper-profile-header button').click(function() {
	  var imageData = $('#image-cropper-profile-header').cropit('export');
	  $(this).text('Processing...');
	  $(this).attr('disabled', true);
	  $.ajax({
			url : "/profile/edit-user-header-image-crop-it",
			type : "POST",
			contentType: 'application/json;charset=UTF-8',
			data : JSON.stringify({'imagedata' : imageData}),
			success : function(response) {
				console.log("success, crop it", response);
				location.reload();
			},
			error : function(xhr) {
				console.log("crop it failed", xhr);
			}
		});
	});

[SDCRoman]

After carefully reading the documentation I found the relevant piece:

[quality=.75] exported image quality, only works when type is
// 'image/jpeg' or 'image/webp'.

var imageData = $('#image-cropper-profile-header').cropit('export', {
        type: 'image/jpeg', // this is needed, otherwise quality does not work only jpeg and webp
	quality: 0.85
});