On 28 Dec 2005 at 14:56, Gonz wrote: > Isnt RAW supposed to contain "raw" RGB data? If any of the individual > pixel sites, R G or B maxes out, it would be useful data. Maybe I dont > care about blowing certain channels (pre-bayer). I know that final RGB > data is a Bayer combination of the RAW data, but the RAW data is still > quite useful. I suspect, but cannot prove without some emperical data > that you will probably find that the pre-bayer and post-bayer RGB > histograms are pretty similar.
Unfortunately the in camera histogram of a RAW file is derived from the jpeg file embedded in it which is in turn affected by both the in camera colour balance and the contrast settings. So the histograms will only be similar in camera and post-bayer if the image is decoded with a similar colour balance, un adjusted levels/exposure and contrast settings. 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
