Digital BW, The Print

I currently have a Canon s750 which prints black only in 600 x 600 
dpi. If I were to upgrade to a Canon i950 which prints black only in 
4800 x 1200, would the dot size change or would there be any 
noticeable difference? While on the subject of printers, what does 
the 4800 x 1200 mean and what directions on the paper do those 
numbers correspond. Is it 4800 dpi vertical or horizonal, and what's 
the diffence in different dpi on a Canon i950 and the Epson 1280 at 
a different dpi?

The reason for the inquiry is related to Black only photo image 
printing.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Johnny Eades 
<jeades1@s...>" <jeades1@s...> wrote:
> I currently have a Canon s750 which prints black only in 600 x 600 
> dpi. If I were to upgrade to a Canon i950 which prints black only 
in 
> 4800 x 1200, would the dot size change or would there be any 
> noticeable difference? While on the subject of printers, what does 
> the 4800 x 1200 mean and what directions on the paper do those 
> numbers correspond. Is it 4800 dpi vertical or horizonal, and 
what's 
> the diffence in different dpi on a Canon i950 and the Epson 1280 at 
> a different dpi?

As far as direction - the manufacturer's website should have the 
spec's but my guess is the 4800 is horizontal and the 1200 is 
vertical.

The resolution is NOT a good predictor of dot size.  Again this is a 
question you should easily be able to answer from the manufacturer's 
own spec's, but typically the drop size is a better predictor of dot 
size - FOR A GIVEN PAPER - and the trend is for smaller and smaller 
drop sizes as the technology has advanced.  The s750 has a 5 
picoliter drop size; the i950 has a 2 picoliter drop size, so the 
latter should give you a finer pattern.