Usually, this is the difference in the number of colors used for an
inkjet printer. 3 or 4 colors for a basic inkjet vs. 6+ colors for a
photo inkjet printer.
Why?
Simply view samples here:
http://www.silverace.com/dottyspotty/issue9.html
6+ colors = smoother printer, less grain and dots, better, more
photographic prints than 3 or 4 color inkjet printers.
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This does not apply to other technologies such as dye-sub printers or
FujiFilm Pictrography printers, which can easily match and exceed the
quality of inkjet printers using only 3 or 4 colors. (different print
process, so you can't compare colors vs. quality across all three
systems just by counting colors)
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Recommendation: If you're doing photo prints, get a 6+ color inkjet (or
dye-sub or Pictrography $$$$ expensive printers) today. If you're doing
only office work, 3 or 4 colors is fine, or better and cheaper, a B&W
laser printer (cheaper per page costs).
Here, even the $59 refurb'd (but with full 1 year warranty!) Epson 820
6-color printer will give you far, far better prints than any 3 or 4
color inkjet printer:
http://shopper.cnet.com/4014-3156_9-21041605.html?tag=ob_50&orderby=50&sort=asc
Note: you'll be hard pressed to see the difference between a 6 color
printer vs. 7 or 8 unless you have identical prints from a color test
target and carefully examine these prints close up. In other words, if
you aren't neurotic about quality, but would like nice, don't worry as
long as you have something 6+ colors in an inkjet. Otherwise, the
8-color printers are nicer albeit at a higher price. This also means
for most people, the output from that $59 epson isn't going to be much
different, if even noticably so, vs. a $300-600 7 or 8 color inkjet --
so save money if you're not so picky.
Note: Combo printers such as the Epson R300 for $200 (6-color inkjet +
CD printing + flash card reader + direct from flash card printing) or
the Epson RX500 for $250 (which adds color scanning,
(with direct scanning of images to flash card w/o a PC), color slide and
negative scanning, color copying, and the same nice built-in flash card
reader slots and individual, 6-color photo ink sets) are nice models to
consider if you want to save space and get the benefits of the added
features.