blender image only 72dpi??

How do I render a still in blender with a resolution different from 72 dpi?Even a .tga!? At that resolution it’s almost useless. Except for the net of course.I know u guys always respond fast. Thanx again.

Render bigger image and convert it to a higher dpi / smaller size image with gimp or photoshop.

Btw. https://blenderartists.org/forum/viewtopic.php?t=58052