Image resoltion question

I have a basic question about image resolution. I have taken
some pics for a brochure with a digital camera. The pictures are
2800 x 2100 pix. (6.1 MP), 72 DPI.
My printer recommends sending TIFF format at 300 DPI. I can
create a postcard at 300 DPI and add the image, without resampling
the image.
Will that print ok, or do I need to find a digital camera
that will shoot at 300 DPI. I am obviously a novice and I could not
find an answer to my question in the archives.
Thanks.

On Thu, 17 Aug 2006 22:56:42 +0400, bwr
<[email protected]>
wrote:
> I have a basic question about image resolution. I have
taken some pics
> for a
> brochure with a digital camera. The pictures are 2800 x
2100 pix. (6.1
> MP), 72
> DPI.
As a small addition to what Richard said, I think I'll
explain in more
detail while camera ppi (or dpi) is a fake.
From practical point of view, neither camera nor your eye
have resolution
in "inches". Both your eye and your camera have *angular*
resolution, not
*linear*. It may be recalculated to linear only when you are
referring to
particular viewing distance - that is, from a long distance
you only
recongize objects of meter size, and from a hand distance -
of millimeter
size; and they may take the same amount of pixels in your
camera photos.
As a result, there is no such a thing like "best resolution
for print" -
you may print large billboard at much smaller resolution than
fine art
catalog, and both will look the same under appropriate
circumstances - one
from several meters distance, the other being viewed through
a looking
glass. Also, there is no such a thing as "camera resolution"
(unless we
put the real ruler in the scene <g>). There may be
*formal* resolution
setting the camera puts in the image file, or even more
likely some formal
resolution assumption your software makes when it reads the
file without
any resolution setting in it (you know, software don't like
"divide by
zero" things, so it often makes some non-zero assumptions
when it can't
get real figures).
So forget about resolution of camera files. All you need is
enough pixels
to cover the number of inches that you wish, under the print
resolution
you want. As Joe said, you are likely to have more than you
need.
Ilya Razmanov
http://photoshop.msk.ru -
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