The full width, fixed height image responds to browser or device width but its height remains fixed.
A fully responsive image responds to changes in device or browser width both in width and height. The maximum width setting is used to control its width when viewed on wide screens.
Fade On Scroll
The widget will create either a full width, fixed height image or an image which can be made responsive by checking the "Full Width" box in the metrics inspector and setting a maximum width.
The image will then fade on scroll over the amount set in the widget settings.
Adjust the browser width to see how the different images respond.