This option allows you to customize several options in slideshow.
When if a small image is zoomed in, the zoomed image is seem aliased. But this option is checked, the zoomed image's quality is improved by interpolation functions.
If you want to zoom in/out by relative to mouse position, check here.
In here background is used background color in slideshow. You can change the color to select one of the colors in combo-box or color box you want.
The toolbar contains commands that is frequently used. To avoid interference the viewing the pictures it is represented by translucent. You can change the intensity of translucent by adjust to control the opacity slider.