Re: ScanROM 4E

[P3D Michael Kersenbrock <michaelk@xxxxxxxxxxx>]

> > have a dyesub printer, 1 dot -> 1 pixel, so if you have a 300x300 dpi
> > dyesub, ideally you want a 600x600 pixel per inch scanner.
> 
> This is absolutely not true.  Each printer "dot" is either on or off,
> so you only get two values per color.  The way halftoning works to get
> intermediate color values is by clustering dots to approximate the
> effect of larger dots.

It "is true" for dye-sub's.  Each "dot" of a dye-sublimation printer is essentially
a continuous tone dot.  Each dot gets a controlled-diffusion of sorts from
each primary dye color.  In other words, dye-sub printers don't use halftoning
to produce the color spectrum. This is why seemingly low resolution dye-sub
printers print such beautiful prints.

Friend of mine used to be manager of the high end dye-sub printers at Tektronix.
I've got some "demo prints" he gave me around somewhere that look really 
really nice.  :-)


Mike K.


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