Digital BW, The Print

Peter,

From the Epson info that I have read, the 2450 has a 6-line alternated
sensor with 61,000 sensor elements. So the sensor elements are presumably
spaced at 1/1200 inch with alternate lines staggered to fill in the missing
elements by interpolation. You can't escape interpolation it seems, even at
optical or native resolutions!

Or have I misread the info? Austin will know!

Bob Frost.


----- Original Message -----
From: "Peter Marquis-Kyle" <petermk@...>

> The Epson 2450 can scan at 2400 x 4800 samples per inch. Imagine a row of
> sensors spaced at 1/2400 inch, which steps across the original at 1/4800
inch
> intervals. But your image editing program (Photoshop or whatever) can't
deal
> with pixels that are not on a square grid.
>
> To use the 2400 x 4800 scan the scanner software has to interpolate to
4800 x
> 4800, by 'inventing' the missing pixels by averaging the neighbouring
pixels. If
> you tell the scanner to sample at 2400 x 2400 the sensors step across the
> original at 1/2400 inch intervals, and every pixel is 'real'. Native
resolution.