[Gimp-user] pixels to dpi

[David Gowers]

On Wed, Apr 8, 2009 at 12:44 AM, Jay Smith <jay at jaysmith.com> wrote:
> Norman,
>
> So, to scan that postage stamp that you want to turn into a wall poster,
> you might scan it at a very high 2400 x 2400 resolution.  Then, in your
> image program, change the size from 1x1-inch up to 20x20 inches AT THE
> VERY  SAME TIME AS YOU _reduce_ the resolution to 300x300 dots/pixels

Just to clarify: This is unnecessary. If you want to blow up
something, just reduce the resolution. Halving the resolution is all
that would be required to turn a 600x600 (1 inch square) 600dpi image
into a 600x600 (2 inch square) 300dpi image.
The inches measurement should automatically update itself, since it's
dependent on image resolution.

David