You can set the Main Background transparent, Colored, or via an image source. Change the Image aligns, cover/contain/normal fillings and Repeating via the data options
<li data-transition="fade" data-slotamount="7" data-masterspeed="1500" > <!-- MAIN IMAGE --> <img src="../examples&source/images/transparent.png" alt="slidebg1" data-bgfit="cover" data-bgposition="left top" data-bgrepeat="no-repeat"> ...
<li data-transition="fade" data-slotamount="7" data-masterspeed="1500" > <!-- MAIN IMAGE --> <img src="../examples&source/images/transparent.png" style="background-color:#ff0000" alt="slidebg1" data-bgfit="cover" data-bgposition="left top" data-bgrepeat="no-repeat"> ...
<li data-transition="fade" data-slotamount="7" data-masterspeed="1500" > <!-- MAIN IMAGE --> <img src="../examples&source/images/someimage.png" alt="slidebg1" data-bgfit="cover" data-bgposition="center center" data-bgrepeat="no-repeat"> ...
<li data-transition="fade" data-slotamount="7" data-masterspeed="1500" > <!-- MAIN IMAGE --> <img src="../examples&source/images/someimage.png" alt="slidebg1" data-bgfit="contain" data-bgposition="center center" data-bgrepeat="no-repeat"> ...
<li data-transition="fade" data-slotamount="7" data-masterspeed="1500" > <!-- MAIN IMAGE --> <img src="../examples&source/images/tiledimage.png" alt="slidebg1" data-bgfit="normal" data-bgposition="top left" data-bgrepeat="repeat"> ...