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To establish the baseline with something you probably already know:
dpi=dots per inch
ppi=pixels (picture elements) per inch.
As far as I've been able to determine, they are functionally equivalent, if
not identical. For excruciating detail about resolution, you could see my
review in a recent _Technical Communication_ of Tim Daly's book _Digital
Photography_ (or the book itself).
Probably a more relevant consideration is whether all the elements of your
multifunction device go down if one of the elements does. Remember those old
console TV/HI-FI phonograph/radio consoles?
Newton's Telecom Dictionary describes both in terms of scanner resolution or
accuracy.
Resolution (definition #4): "A measure of the quality of a transmitted
image. Beginning with the scan processing in the transmitter and ending
withthe display and/or printing process in the receiver, resolution is a
basic parameter of any image transmission system. It affects the design of
all its subsystems. In the scanner, the resolution is a function of the spot
size [with] which the scanner optics and associated electronics "look" at
the scene and through which the system can uniquely identify the smallest
distance along the scan line. Resolution is measured [in] terms of the
density of the picture elements (pixels) and is the total number of pixels
(horizontal x vertical) used to display alphanumeric characters or graphic
images on the screen. High resolution images are composed of more dots per
inch and appear smoother than low-resolution images. The higher the
resolution, the better the display of details."
Scanner Accuracy: "The accuracy at which a scanner inputs information is
measured intwo ways: by resolution and color information. Resolution is
defined as dpi (dots per inch) or pixels, which determines the maximum size
of the immage. For example, a 2,400 pixel by 1,800 pixel image scanned by a
scanner at 300 dpi creates a maximum image of 8" x 6". Color inforation is
defined by the number of bits of information per color. Most scanners
produce images with 24 bits per pixel (8 bits each of red, green, and blue).
The more pixels and bits of information per color, the larger the iimaged
file and the more accurate the representation will be."
Anyway, HTH. I opted for separate devices, but YMMV.
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A landmark hotel, one of America's most beautiful cities, and
three and a half days of immersion in the state of the art:
IPCC 01, Oct. 24-27 in Santa Fe. http://ieeepcs.org/2001/
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