Re: RE: tifs at 240 dpi worth redoing?

[Robert Lauriston <robert -at- lauriston -dot- com>]

Pixels per inch is no more meaningful than dpi.

What you get from a digital camera is a grid of X pixels by Y pixels that
bears no fixed relationship to any particular number of inches. E.g. my
passable consumer-grade camera's default image size is 3264x2448, which at
300 dpi would be 10.88" x 8.16".

If your output is going to be 300 dpi at, say, 6" x 4", then to avoid
pixellation and other downsampling / upsampling artifacts you want the
digital photos to be 300 ppi for that output size, or a whole-number
multiple of 300 ppi (e.g. 600, 900, or 1200 ppi), or a power-of-two fraction
of 300 ppi (150 or 75 ppi).

On Tue, Nov 10, 2009 at 9:01 AM, Boudreaux, Madelyn (GE Healthcare,
consultant) <MadelynBoudreaux -at- ge -dot- com> wrote:

> Nancy Allison exclaimed:
> >Curiouser and curiouser! The original images *are* at 240 dpi,
> >which surprises me.
>
> It doesn't surprise me. Speaking from experience, Canon and NIKON DSLRs
> shoot RAW at 240DPI. Google suggests Pentax does as well, and if I'm not
> mistaken, it's the standard at this point for high-resolution RAW
> images. They store far more information than just the visible pixels.
>
> Furthermore, DPI actually has no meaning in the digital photography
> world. It's technically PPI. DPI refers to the printed size. PPI
> involves the number of pixels recorded by the camera. ...
>
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