On 12 Sep 2004 at 22:14, Shel Belinkoff wrote: > I asked about 12-bit color space. That was my terminology.
OK, not quite the correct terminology, a colour space can be defined independent of bit depth, see: http://www.drycreekphoto.com/Learn/color_spaces.htm > But, if I understand what you're saying, then the istd does not record 16 > bits/channel, rather only12 bits. The 16 bits comes about thru some sort > of interpolation or mathematical wizardry. Perhaps this is an > oversimplification, but that's ok for me for now. And you say that this > interpolation will "provide up to 16 bits precision." That implies that it may > not actually provide 16bits, only up to 16bits in certain circumstances. It's all wizardry, all outputs except RAW (which isn't a conventional image format as such) have to be interpolated. The *ist D sensor has 6.3MPixels of which 1/2 record green luminance, 1/4 red and the remainder blue yet at any bit depth (8 or 16) output it still delivers 6.1MPixels with a red green and blue luminance value at each pixel. This is true for any digital camera that has a single sensor and isn't a Foveon design. The Pentax RAW convertor will provide TIFF files at 8 or 16bit colour depth, and the PS CS convertor will decode and import a Pentax RAW file as an 8 bit or 16bit (per colour) image. Regardless the RAW file always contains 12 pits per pixel (an 8 bit JPG file contains 24 bits per pixel) Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
