re: Artec scanner

[P3D Tom White <tomwhite@xxxxxxx>]

Allen French writes: (snip)

>The cheap ($119) Logitech Color Scan feed-thru type scanner I just bought
>only scans color prints at 200 dpi. I tried to increase the resolution
>through Paint Shop Pro shareware software, but it didn't help. Any one
>have good results with interpolation software for web-quality viewing
>of 3d slides or prints?

If you are scanning photos for presentation on a computer screen, there is
no point in scanning at any higher resolution than the screen itself. If
your screen is 800 pixels wide, and you want the scanned photo to fill the
screen side to side, you scan at a resolution to give you 800 *dots* for the
whole photo. i.e. For a 4" wide photo, 200 dpi = 800 pixels.

Yes:  each dot is a pixel on the screen.  The number of pixels = W(in
inches) X dpi. Or height and what ever units you want. You can not improve
on screen resoultion by scanning at a higher resolution than you can
display. In fact, you can lose resolution due to the fact that photo
resizing software does not always make good decisions about which pixels to
leave out (or add) in the process of scaling.

Scanning for printing is a totally different set of problems.

My experience has shown that most stereo photo pairs for screen presentation
scan best at about 170 dpi for both the 15" screen and the 17".

Hope this helps.

Tom White
Driftwood, Texas



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