White Screen

The White Screen command displays an entire window of uniform white. This makes a perfect target for testing your digital camera for dust.

Photograph the white screen from up close with the aperture set to f/16 or higher and a relatively long exposure - no need to focus. The resulting image will show up any debris on the camera sensor so you can check if it needs to be cleaned. To exaggerate dust spots and smudges in the image, use the Autorange transformation.

To clear the white screen, click anywhere in the main window or press any key.