# [pdftex] png including and scaling magic(?)

Martin Jansche jansche at ling.ohio-state.edu
Mon Sep 8 10:28:12 CEST 2003

```On Mon, 8 Sep 2003, franciszek holop wrote:

> by experimenting, i have found out that scaling all the png's by the
> factor of 0.68 gives very nice pictures (by that i mean natural sized
> pictures, just as when captured) on the screen at particular zoom levels
> in gv(2.0, natural size) and in acrobat(147% - almost 150%).  all the
> pictures are 72dpi, and they are added with the
> \includegraphics[scale=0.68]{picture.png} command.
>
> i was wondering why is this, and whether this 0.68 is a magic number or
> what.  haven't seen in any faq or posts.

Do the math: 0.68 * 1.47 = 0.9996. This is as close to 1 as you'll