Archived posting to the Leica Users Group, 2001/11/07

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: RE: [Leica] Color vs B/W and Digital
From: David Rodgers <drodgers@swiftnet.com>
Date: Wed, 07 Nov 2001 19:24:51 -0800
References: <5.1.0.14.0.20011107090445.00a58000@swiftnet.com>

Austin,

Thanks. Makes sense to me. I understand the Leafscans are pretty nice. I 
know of a 35 that's gathering dust. Be great for my b/w 35mm negs but the 
owner won't part with it....yet.

Dave.

At 01:11 PM 11/7/2001 -0500, you wrote:
> > 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

- --
To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html

In reply to: Message from David Rodgers <drodgers@swiftnet.com> ([Leica] Color vs B/W and Digital)