xfdesktop is responsible for drawing the desktop's background, or “wallpaper”, as well as icons on your desktop.

Desktop with icons

There are various options for setting a background image - the final background is composed of a solid color or gradient, with an image (with optional transparency) composited on top. Images can manipulated in various ways to fill the screen, such as being stretched, zoomed, scaled, centered or tiled.

Tiled background image

Rather than an image, a color or gradient of two colors can also be used as the desktop background. Gradients can be either horizontal or vertical.

Vertical gradient background

As the final background can be composed of a color and an image on top, you can mix the two to produce some interesting effects using semi-transparent images on top of various colors. When an image is centered or scaled and doesn't fill the exact dimensions, the background color is shown on either side of the image.

Horizontal gradient background with semi-transparent image on top