Archived posting to the Leica Users Group, 2001/11/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Austin, > > Interesting. Are you referring to the Leafscan 35? That and the Leafscan 45...I use both. The 45 is 5080, and the 35 is 4000. > Seems to me color gets all the attention in digital. But what about b/w? For the most part, that's ALL I do. > This may be faulty logic on my part, but I'll throw it out. The current > commerically viable pirosumer CCDs are capable of scanning 4000 > dpi color. > I assume this requires 4 sensors in a quad and not linear configuration > (could be wrong but it seems that's the case when I looked at some CCD > schematics a while back) Film scanners to not require 4 sensors in a quad...they use three FULL width sensors (or scan three with three passes, one for each color with a different filter). The issue you refer to is not an issue with film scanners. > Does that mean someone could manufacture a greyscale scanner that > scans at > twice the resolution, or 8000 dpi? Separate issue... > Or better yet, might someone > write some > different firmware or software that would allow current scanners to do > that. Look what Jon Cone did for inkjet printing of greyscale images with > Piezography with a custom driver. Really entirely different beast. Cone really didn't increase the resolution of the printer, but uses all four ink positions so he can get much tighter spacing on the tones (since you can now use 4x as many inks in your dither pattern), therefore it appears dotless. Scanners are typically limited on one axis by the stepper motor resolution...and they can only step in such a small increment...and on the other axis by the width of the sensor combined with the magnification. Regards, Austin - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html