--- You wrote:
Anything over 300dpi is wasted.
--- end of quote ---
Here is a way to see this.  Take a good quality 4x6 photographic print.  I mean
a good one from a good processor who knows how to focus his machine.  Stick it
in your flatbed scanner and scan it at 600dpi and 300 dpi.  On your monitor,
zoom in on a sharp detail of the image in both versions and see if there is any
difference in detail, sharpness, apparent graininess or anything else.

I'd bet you won't see any more in the higher resolution image, because detail
that fine isn't in the original print.  

Now we are talking about what is available in chemical photographs.   Can we
expect digital prints to be any better?   Does anyone look at fine prints,
chemical or mechanical, with a powerful magnifying glass?

On the other hand, printing is different from scanning.  The resolution we send
the printer is at our option.  What the printer does with it depends on it's
software and hardware.  But we can be sure that if we give it too many pixels,
it will throw some of them away before they get to the paper.

One would think the printer manufacturers who know the exact answers would tell
us.

Rich

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