Yes, 12 bit was added to postscript for x-rays. brucee
On 4/28/06, Jack Johnson <[EMAIL PROTECTED]> wrote: > On 4/27/06, Charles Forsyth <[EMAIL PROTECTED]> wrote: > > > And, BTW, PNG allows 16-bit per colour, a 48-bit depth per pixel. > > > Thanks to libpng, my "npng" can render these as 24-bit images. > > > > ``the human ear can't hear as high as that / still, it ought to please any > > passing bat'' > > I used to do some image fiddling a long time ago (image prep -> TGA > for television), and came across some info regarding medical x-ray > photographs being stored in a 12-bit grayscale format. It's likely > that so fine a variation is either above or right on the edge of human > perception (given current working environments), but one > counterargument is that maybe it's not a human looking at the data. > > Plus, I think 12 bits per color would be right around the limit of > film, something like a 4000:1 contrast ratio, so depending on the > scanner you'd likely be pushing the limits of the original medium > anyway, "lossless" transfer from analog to digital, whether or not > you're in a good position to make use of the data. > > Archaeologists have the same problem all the time, looking at data > gathered by previous scientists and realizing the original gatherers > didn't save enough information for the current questions, so now they > tend to swing the opposite direction and record all the minutiae so > that years later someone can glean new information from an old dig. > > One day, you may be a bat. > > -Jack >
