Digital BW, The Print

A. Huntley wrote:

>Julian,
>
>Not to ask a dumb question...what does 3200 in one direction mean? I thought
>the Epson 1680 had a top-end optical resolution of
>1600, and that anything over this number--I think you can go to 12,800 or
>something like that--was interpolated.
>  
>
It's FAAAAAR from dumb..

The horizontal resolution is controlled by the placement of the ccds 
horizontally.  That's resolution set simply by physical proximity and is 
static and unchangeable.

The vertical resolution is controlled by the stepper motor, and a scan 
pass is done at each 1600th/inch.  

Hopefully you can see that while it may be easy enough to get ccds lined 
up horizontally within 1/3200 of an inch, it is another thing to 
reliably and repeatedly get increments of 1/3200th out of a motor drive..

Kennedy McEwen went through an amazing series of discussions on this and 
interference patterns, grain resolution,  etc. some time ago over on the 
x7x list (maybe in the Spring?).. If you go there and search  the 
archives, you can find them, quite enlightening..
Keith

 

"Just some guy," and founder of the Multiverse's largest EPSON printer 
User Community (highly recommended by Vogon Poets and MegaDodo 
Publications), at:

http://groups.yahoo.com/group/EPSONx7x_Printers/
 
"For the rest of you out there, the secret is to bang the rocks together 
guys"

 




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