[ale] OT: megapixels

[Sean Kilpatrick]

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On Tuesday 06 May 2003 11:55 pm, Ray Knight wrote:
>  At the time I had an Epson Stylus Color 600 and
> printing on photo paper gave marginal results.  I recently acquired a
> Canon I-850 and now 3"x5" prints on photo quality paper are almost
> indistinguishable from drug store prints.


The answer is in the math.

A 3"X5" image needs 937,000 dots to print at 250 dpi on a
modern color inkjet printer.  Even at 300 dpi, the image
would have to be interpolated only to 1,350,000 dpi -- a
35% enlargement that looks good when handled by modern
algorithms. And at 200 dpi only 600,000 "dots" are needed.
But try to print an 8X10 and those numbers need to be
increased by more than 675%.
I need to spend some time today cleaning up a photograph
and sending it out. Fortunately the customer on the other
end has a DSL connection as the TIF image will end up being
about 14 mgb by the time I attach it to an e-mail. But that
much data will enable a good looking 8X10 print.
I think I'll go to lunch after hitting the send button as
my DSL connection is S-L-O-W on the uplink side. <grin>

Sean

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