converter.thumbnailResizeQuality Property ActiveX/Java Uploader JavaScript

$au.uploader({
    converters : [
        {
            //...other params...
            thumbnailResizeQuality: "Medium",
            //...other params...
        }
    ]
})

$au.uploader('uploaderID').converters().get(index).thumbnailResizeQuality(value);
value = $au.uploader('uploaderID').converters().get(index).thumbnailResizeQuality();