This reference is for Processing 2.0+. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.
background(255, 204, 0);
PImage img; img = loadImage("laDefense.jpg"); background(img);
The background() function sets the color used for the background of the Processing window. The default background is light gray. background() is typically used within the draw() function to clear the display window at the beginning of each frame.
An image can also be used as the background for a sketch, although the image's width and height must match that of the sketch window. To resize an image to the size of the sketch window, use image.resize(width, height).
Images used with background() will ignore the current tint() setting.
It is not possible to use transparency (alpha) with background colors on the main drawing surface; you can acheive the same effect with createGraphics().
background(rgb) background(rgb, alpha) background(gray) background(gray, alpha) background(v1, v2, v3) background(v1, v2, v3, alpha) background(image)