On Sat, Sep 09, 2006 at 10:46:48AM -0500, Gonz wrote: > > So what about the 22bit A/D? What are they doing with the other 10 bits > of information? Are they using it for some type of noise removal?
There are no extra 10 bits of information. The original sensor is unlikely to yield more than 12-bit; data as has been pointed out many times there are perhaps 40,000 photons available to be counted (which would fit easily in 16 bits, at the most). As there is thermal and electrical noise making it difficult to get useful signal into (or out of) the low-order bits, there's unlikely to be even 12 bits of information present. It's a good idea to add a couple of extra bits to the processing path to prevent additional round-off errors accumulating, especially if there are non-linear processing steps such as gamma correction, but I find it hard to believe that more than 16 bits would be needed. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
