Re: Scanning Photos

["Darren Yates" <dyates@pnc.com.au>]

No worries...
Yes, I guess I should have been more clear...
SPI is something Hewlett-Packard has been trying to push into the industry
for the last couple of years.
Darren.

MarkBau1 wrote in message <19990622192644.14574.00002065@ng-fl1.aol.com>...
>My mistake, I thought you were talking about posting a pic at 150ppi
rereading
>your two posts it seems like you are advocating scanning higher then
resampling
>to a lower ppi which is in fact the way to go. You didn't mention that you
are
>posting the pic at less than 150.
>
><<<If you're so conversant with the whole topic, please tell us all the
>difference between PPI and DPI...>>>>
>
>Until very recently scanning was done for the single purpose of preparing
an
>image for press. Thus, the term dpi was always used as it related to the
line
>screen you were going to press with. Now we scan photos that are never
going to
>be viewed on anything but a monitor. Monitors do not have dots, they have
>pixels, so when talking about displaying an image on screen you are talking
>about how many pixels will display the image.
>
>Most scanning software still uses the generic term dpi but some newer
software
>is using the much more correct term of spi, (samples per inch) which is
what a
>scanner is actually doing when it scans. After the scan you use dpi if you
are
>going to press or ppi if the image is intended for screen display.
>
>To sum up:
>A scanner's resolution is measured in samples per inch
>
>A printer or imagesetter's resolution is measured in dots per inch.
>
>A monitor's resolution is measured is pixels per inch.
>
>Mark.
>
>
>Visit my train pic website at:
>http://home.earthlink.net/~markbau/
>
>