A SANE image is a rectangular area. The rectangular area is subdivided into a number of rows and columns. At the intersection of each row and column is a quadratic pixel. A pixel consists of one or more sample values. Each sample value represents one channel (e.g., the red channel). Each sample value has a certain bit depth. The bit depth is fixed for the entire image and can be as small as one bit. Valid bit depths are 1, 8, or 16 bits per sample. If a device's natural bit depth is something else, it is up to the driver to scale the sample values appropriately (e.g., a 4 bit sample could be scaled by a factor of four to represent a sample value of depth 8).
So the answer is yes. Hope this helps, -- Olaf Meeuwissen, LPIC-2 FLOSS Engineer -- AVASYS Corporation FSF Associate Member #1962 Help support software freedom http://www.fsf.org/jf?referrer=1962