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[filmscanners] RE: dpi - formerly PS sharpening



Austin,

Like it or not, DPI tends to be the common usage in the everyday world even
if technically it is the wrong terminology and should in the case of
scanning be PPI.  I think that you may be being a little picky here; but
more importantly, holding the wrong party accountible for the industries
terminological confusion.  Let's not start another argument over language
usage when we all kniow what is being referred to.  The other debate at
least had some substantive communicative problems associated with it; this
one does not.  All my scanning software used the DPI designation rather than
the PPI designation accept one which used LPI, allowing one to set the PPI
and the multiplier to get a LPI setting for the scan.

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Austin Franklin
Sent: Thursday, August 15, 2002 5:33 PM
To: laurie@advancenet.net
Subject: [filmscanners] RE: dpi - formerly PS sharpening



> I usually leave images on my site set to the DPI of the scans,
> so they are
> always at 2700 or 4000 dpi.

Anthony,

What on earth are you talking about?  Where do you set the DPI of the scan?
Scanners scan in SAMPLES PER INCH, and create files that are PIXELS PER
INCH.  You are saving a file that is PIXELS PER INCH.  Only printers use
DOTS PER INCH, and that value is printer dependant, and is NOT directly
related to any of the information saved in the file.

In the PS "Image/Image Size" window, you simply have the option of setting
the number of inches and/or the number of PIXELS/inch, or PIXELS per cm.
The top gives the image width and height in PIXELS.  I see NO option for
"DPI" here.

When you save an image at 2700 you are saving it at 2700 PIXELS per inch, as
far as I can find, there is no option for saving your image in "DOTS" using
PS.

Austin

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