Scanner art is art made by placing objects on a flatbed scanner and scanning them. There has been some debate as to whether scanner art is a form of digital photography.Images made with a scanner differ from those made with a camera, as the scanner has very little depth of field and a constant light all over the surface.The simplest use of the scanner, which also most closely matches its use for document capture, is as a specialized tool for macro photography. As long as the subject can be placed on the scanner bed, the scanner is excellent for capturing very high resolution images, within its limitations.
A common artistic use of the scanner is to capture collages of objects. The objects are arranged by the artist on the scanner bed, and then captured. Since the artist is working from the back of the image, it can be difficult to get the desired arrangement. Scanning software with the ability to generate a low resolution preview scan can help in obtaining the desired arrangement before the final, high resolution scan is made.
Capturing a moving subject with the scanner can be viewed as a problem, or as an opportunity for artistic effect. As the subject moves during the scan, distortions are caused along the axis of the scan head's movement, as it captures different periods of the subject's movement line by line in a manner similar to slit-scan photography. The artist can use this by aligning the direction of the scan head's movement to deliberately caused the desired distortion.
While the result of a scanner capture provides a work of digital art, just as a digital photograph does, further manipulation of the captured image are possible as well. This may be as simple as flattening the background to enhance the "floating" effect provided by the scanner to complete reworking of the image.
You can find more about scannography at http://www.scannography.org
***article from wikipedia.com
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