On 16/10/06, J. C. O'Connell <[EMAIL PROTECTED]> wrote: > False, you can scale any A/D and D/A > To give any dynamic range you want > Independent of bit depth. The number > Of bits you use determines ONLY > The number of steps. In the case > Digital imaging for example, it just > Means there will less shades of gray > Between pure black and pure white > As you lower the bit depth but you > Still can record and regenerate any > Dynamic range you want with lower > Bit depth. Your assuming that the > Encoding always has to be linear > And it doesn't always have to be > Linear. For example a typical > Digital phone company channel has the > Equivalent of 14 linear dynamic > Range but it's only 8 bits with > Pre and post processing. There > Are only 256 levels ( same as shades ) > But they are scaled to a different > Dynaminc range via pre and post > A/D D/A stages. Same with photography.
This is precisely what the pre-gamma transform in the Nucore processor does, it de-linearises the 22 bit data to neatly fit into 12, 14 or 16 bits (depending upon the model) and it uses various forms of digital gain control to assure that the sampled data makes full use of the available bits in the RAW output. -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
