On Wed, 20 Jun 2001 21:59:33 -0400 Austin Franklin
(darkroom@ix.netcom.com) wrote:
> It's entirely different. Incandescent lamps used for such are diffuse
> and
> are not near as focused as LEDs. Using commercially available standard
> parts, you need individual LEDs because you need three colors.
Bah, small minded Luddites abound ;-) Of course the real advance will be
to use high-intensity TFT panels as a scanner lightsource, strobing RGB
sequentially and <GET THIS> self-masking in a closed-loop with the CCD. A
calibration prescan will allow user and/or automated control of curves, to
attenuate or boost TFT pixel brightness on an individual basis, thereby
ensuring maximum shadow detail (all kept above the noise floor),
unblowable highlights, balancing of bright areas like skies at scan time,
and an OD range of about 12.6 <g>
A shame TFT doesn't have room for IR, but I'm sure that can be fixed.
Interested scanner manufacturers should forward large bundles of used $50
notes to me ASAP <g>
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner
info & comparisons
